Combining Philosophers

All the ideas for Eucleides, Saul A. Kripke and Gilbert Harman

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209 ideas

1. Philosophy / E. Nature of Metaphysics / 2. Possibility of Metaphysics
Kripke separated semantics from metaphysics, rather than linking them, making the latter independent [Kripke, by Stalnaker]
1. Philosophy / F. Analytic Philosophy / 4. Conceptual Analysis
Analyses of concepts using entirely different terms are very inclined to fail [Kripke]
2. Reason / A. Nature of Reason / 1. On Reason
Inference is never a conscious process [Harman]
The rules of reasoning are not the rules of logic [Harman]
If there is a great cost to avoiding inconsistency, we learn to reason our way around it [Harman]
Logic has little relevance to reasoning, except when logical conclusions are immediate [Harman]
You can be rational with undetected or minor inconsistencies [Harman]
It is a principle of reasoning not to clutter your mind with trivialities [Harman]
2. Reason / A. Nature of Reason / 4. Aims of Reason
Reasoning might be defined in terms of its functional role, which is to produce knowledge [Harman]
Implication just accumulates conclusions, but inference may also revise our views [Harman]
2. Reason / A. Nature of Reason / 6. Coherence
Reasoning aims at increasing explanatory coherence [Harman]
Reason conservatively: stick to your beliefs, and prefer reasoning that preserves most of them [Harman]
A coherent conceptual scheme contains best explanations of most of your beliefs [Harman]
2. Reason / A. Nature of Reason / 9. Limits of Reason
If you believe that some of your beliefs are false, then at least one of your beliefs IS false [Harman]
2. Reason / D. Definition / 2. Aims of Definition
Some definitions aim to fix a reference rather than give a meaning [Kripke]
3. Truth / F. Semantic Truth / 2. Semantic Truth
Kripke's semantic theory has actually inspired promising axiomatic theories [Kripke, by Horsten]
Kripke offers a semantic theory of truth (involving models) [Kripke, by Horsten]
3. Truth / G. Axiomatic Truth / 1. Axiomatic Truth
The Tarskian move to a metalanguage may not be essential for truth theories [Kripke, by Gupta]
Certain three-valued languages can contain their own truth predicates [Kripke, by Gupta]
3. Truth / G. Axiomatic Truth / 3. KF Truth Axioms
Kripke classified fixed points, and illuminated their use for clarifications [Kripke, by Halbach]
4. Formal Logic / D. Modal Logic ML / 1. Modal Logic
Propositional modal logic has been proved to be complete [Kripke, by Feferman/Feferman]
Kripke's modal semantics presupposes certain facts about possible worlds [Kripke, by Zalta]
Possible worlds allowed the application of set-theoretic models to modal logic [Kripke]
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
With possible worlds, S4 and S5 are sound and complete, but S1-S3 are not even sound [Kripke, by Rossberg]
4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
The variable domain approach to quantified modal logic invalidates the Barcan Formula [Kripke, by Simchen]
The Barcan formulas fail in models with varying domains [Kripke, by Williamson]
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
We have a theory of logic (implication and inconsistency), but not of inference or reasoning [Harman]
Any two states are logically linked, by being entailed by their conjunction [Harman]
5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
Deductive logic is the only logic there is [Harman]
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
You don't have to accept the conclusion of a valid argument [Harman]
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
Logical form is the part of a sentence structure which involves logical elements [Harman]
A theory of truth in a language must involve a theory of logical form [Harman]
Our underlying predicates represent words in the language, not universal concepts [Harman]
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and
I might accept P and Q as likely, but reject P-and-Q as unlikely [Harman]
5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
Names are rigid, making them unlike definite descriptions [Kripke, by Sainsbury]
Names are rigid designators, which designate the same object in all possible worlds [Kripke]
5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive
A bundle of qualities is a collection of abstractions, so it can't be a particular [Kripke]
A name can still refer even if it satisfies none of its well-known descriptions [Kripke]
We may fix the reference of 'Cicero' by a description, but thereafter the name is rigid [Kripke]
5. Theory of Logic / F. Referring in Logic / 1. Naming / c. Names as referential
Some references, such as 'Neptune', have to be fixed by description rather than baptism [Kripke, by Szabó]
The function of names is simply to refer [Kripke]
Proper names must have referents, because they are not descriptive [Kripke, by Sainsbury]
A name's reference is not fixed by any marks or properties of the referent [Kripke]
A man has two names if the historical chains are different - even if they are the same! [Kripke]
5. Theory of Logic / G. Quantification / 4. Substitutional Quantification
The substitutional quantifier is not in competition with the standard interpretation [Kripke, by Marcus (Barcan)]
7. Existence / D. Theories of Reality / 2. Realism
Kripke's metaphysics (essences, kinds, rigidity) blocks the slide into sociology [Kripke, by Ladyman/Ross]
7. Existence / D. Theories of Reality / 3. Reality
Reality is the overlap of true complete theories [Harman]
9. Objects / A. Existence of Objects / 5. Simples
We might fix identities for small particulars, but it is utopian to hope for such things [Kripke]
9. Objects / A. Existence of Objects / 5. Individuation / b. Individuation by properties
Kripke individuates objects by essential modal properties (and presupposes essentialism) [Kripke, by Putnam]
9. Objects / C. Structure of Objects / 6. Constitution of an Object
Given that a table is made of molecules, could it not be molecular and still be this table? [Kripke]
If we imagine this table made of ice or different wood, we are imagining a different table [Kripke]
A different piece of wood could have been used for that table; constitution isn't identity [Wiggins on Kripke]
9. Objects / D. Essence of Objects / 2. Types of Essence
For Kripke, essence is origin; for Putnam, essence is properties; for Wiggins, essence is membership of a kind [Kripke, by Mautner]
9. Objects / D. Essence of Objects / 5. Essence as Kind
Atomic number 79 is part of the nature of the gold we know [Kripke]
9. Objects / D. Essence of Objects / 7. Essence and Necessity / a. Essence as necessary properties
An essential property is true of an object in any case where it would have existed [Kripke]
De re modality is an object having essential properties [Kripke]
9. Objects / D. Essence of Objects / 9. Essence and Properties
Important properties of an object need not be essential to it [Kripke]
9. Objects / D. Essence of Objects / 10. Essence as Species
Kripke says internal structure fixes species; I say it is genetic affinity and a common descent [Kripke, by Dummett]
Given that Nixon is indeed a human being, that he might not have been does not concern knowledge [Kripke]
9. Objects / D. Essence of Objects / 14. Knowledge of Essences
Kripke claims that some properties, only knowable posteriori, are known a priori to be essential [Kripke, by Soames]
An essence is the necessary properties, derived from an intuitive identity, in origin, type and material [Kripke, by Witt]
9. Objects / E. Objects over Time / 1. Objects over Time
No one seems to know the identity conditions for a material object (or for people) over time [Kripke]
9. Objects / E. Objects over Time / 12. Origin as Essential
If we lose track of origin, how do we show we are maintaining a reference? [Kripke, by Wiggins]
Kripke argues, of the Queen, that parents of an organism are essentially so [Kripke, by Forbes,G]
Could the actual Queen have been born of different parents? [Kripke]
Socrates can't have a necessary origin, because he might have had no 'origin' [Lowe on Kripke]
9. Objects / F. Identity among Objects / 1. Concept of Identity
With the necessity of self-identity plus Leibniz's Law, identity has to be an 'internal' relation [Kripke]
9. Objects / F. Identity among Objects / 5. Self-Identity
A relation can clearly be reflexive, and identity is the smallest reflexive relation [Kripke]
9. Objects / F. Identity among Objects / 6. Identity between Objects
Identity statements can be contingent if they rely on descriptions [Kripke]
If Hesperus and Phosophorus are the same, they can't possibly be different [Kripke]
9. Objects / F. Identity among Objects / 8. Leibniz's Law
The indiscernibility of identicals is as self-evident as the law of contradiction [Kripke]
9. Objects / F. Identity among Objects / 9. Sameness
A vague identity may seem intransitive, and we might want to talk of 'counterparts' [Kripke]
10. Modality / A. Necessity / 2. Nature of Necessity
Kripke says his necessary a posteriori examples are known a priori to be necessary [Kripke, by Mackie,P]
10. Modality / A. Necessity / 7. Natural Necessity
What many people consider merely physically necessary I consider completely necessary [Kripke]
Instead of being regularities, maybe natural laws are the weak a posteriori necessities of Kripke [Kripke, by Psillos]
What is often held to be mere physical necessity is actually metaphysical necessity [Kripke]
Physical necessity may be necessity in the highest degree [Kripke]
10. Modality / B. Possibility / 1. Possibility
Unicorns are vague, so no actual or possible creature could count as a unicorn [Kripke]
10. Modality / B. Possibility / 6. Probability
The Gambler's Fallacy (ten blacks, so red is due) overemphasises the early part of a sequence [Harman]
High probability premises need not imply high probability conclusions [Harman]
10. Modality / C. Sources of Modality / 1. Sources of Necessity
I don't think possible worlds reductively reveal the natures of modal operators etc. [Kripke]
10. Modality / D. Knowledge of Modality / 1. A Priori Necessary
Kripke separates necessary and a priori, proposing necessary a posteriori and contingent a priori examples [Kripke, by O'Grady]
A priori = Necessary because we imagine all worlds, and we know without looking at actuality? [Kripke]
10. Modality / D. Knowledge of Modality / 2. A Priori Contingent
The meter is defined necessarily, but the stick being one meter long is contingent a priori [Kripke]
The very act of designating of an object with properties gives knowledge of a contingent truth [Kripke]
10. Modality / D. Knowledge of Modality / 3. A Posteriori Necessary
"'Hesperus' is 'Phosphorus'" is necessarily true, if it is true, but not known a priori [Kripke]
Theoretical identities are between rigid designators, and so are necessary a posteriori [Kripke]
It is necessary that this table is not made of ice, but we don't know it a priori [Kripke]
Kripke has demonstrated that some necessary truths are only knowable a posteriori [Kripke, by Chalmers]
10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / a. Conceivable as possible
Kripke's essentialist necessary a posteriori opened the gap between conceivable and really possible [Soames on Kripke]
Kripke gets to the necessary a posteriori by only allowing conceivability when combined with actuality [Kripke, by Soames]
10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds
Instead of talking about possible worlds, we can always say "It is possible that.." [Kripke]
10. Modality / E. Possible worlds / 1. Possible Worlds / e. Against possible worlds
Possible worlds are useful in set theory, but can be very misleading elsewhere [Kripke]
10. Modality / E. Possible worlds / 2. Nature of Possible Worlds / a. Nature of possible worlds
Possible worlds aren't puzzling places to learn about, but places we ourselves describe [Kripke]
Probability with dice uses possible worlds, abstractions which fictionally simplify things [Kripke]
10. Modality / E. Possible worlds / 3. Transworld Objects / a. Transworld identity
If we discuss what might have happened to Nixon, we stipulate that it is about Nixon [Kripke]
Transworld identification is unproblematic, because we stipulate that we rigidly refer to something [Kripke]
A table in some possible world should not even be identified by its essential properties [Kripke]
Identification across possible worlds does not need properties, even essential ones [Kripke]
10. Modality / E. Possible worlds / 3. Transworld Objects / b. Rigid designation
Test for rigidity by inserting into the sentence 'N might not have been N' [Kripke, by Lycan]
Kripke avoids difficulties of transworld identity by saying it is a decision, not a discovery [Kripke, by Jacquette]
Saying that natural kinds are 'rigid designators' is the same as saying they are 'indexical' [Kripke, by Putnam]
If Kripke names must still denote a thing in a non-actual situation, the statue isn't its clay [Gibbard on Kripke]
A rigid expression may refer at a world to an object not existing in that world [Kripke, by Sainsbury]
We do not begin with possible worlds and place objects in them; we begin with objects in the real world [Kripke]
It is a necessary truth that Elizabeth II was the child of two particular parents [Kripke]
A 'rigid designator' designates the same object in all possible worlds [Kripke]
We cannot say that Nixon might have been a different man from the one he actually was [Kripke]
Kaplan's 'Dthat' is a useful operator for transforming a description into a rigid designation [Kripke]
10. Modality / E. Possible worlds / 3. Transworld Objects / c. Counterparts
Modal statements about this table never refer to counterparts; that confuses epistemology and metaphysics [Kripke]
The best known objection to counterparts is Kripke's, that Humphrey doesn't care if his counterpart wins [Kripke, by Sider]
10. Modality / E. Possible worlds / 3. Transworld Objects / e. Possible Objects
That there might have been unicorns is false; we don't know the circumstances for unicorns [Kripke]
11. Knowledge Aims / A. Knowledge / 4. Belief / c. Aim of beliefs
We strongly desire to believe what is true, even though logic does not require it [Harman]
11. Knowledge Aims / A. Knowledge / 4. Belief / e. Belief holism
You have to reaffirm all your beliefs when you make a logical inference [Harman]
12. Knowledge Sources / A. A Priori Knowledge / 1. Nature of the A Priori
Kripke has breathed new life into the a priori/a posteriori distinction [Kripke, by Lowe]
Rather than 'a priori truth', it is best to stick to whether some person knows it on a priori evidence [Kripke]
A priori truths can be known independently of experience - but they don't have to be [Kripke]
12. Knowledge Sources / A. A Priori Knowledge / 8. A Priori as Analytic
The a priori analytic truths involving fixing of reference are contingent [Kripke]
Only lack of imagination makes us think that 'cats are animals' is analytic [Harman]
Kripke was more successful in illuminating necessity than a priority (and their relations to analyticity) [Kripke, by Soames]
Analytic judgements are a priori, even when their content is empirical [Kripke]
Analyticity is postulated because we can't imagine some things being true, but we may just lack imagination [Harman]
12. Knowledge Sources / E. Direct Knowledge / 2. Intuition
Intuition is the strongest possible evidence one can have about anything [Kripke]
12. Knowledge Sources / E. Direct Knowledge / 4. Memory
Memories are not just preserved, they are constantly reinferred [Harman]
13. Knowledge Criteria / A. Justification Problems / 3. Internal or External / b. Pro-externalism
People's reasons for belief are rarely conscious [Harman]
13. Knowledge Criteria / B. Internal Justification / 3. Evidentialism / a. Evidence
We don't distinguish between accepting, and accepting as evidence [Harman]
13. Knowledge Criteria / B. Internal Justification / 5. Coherentism / a. Coherence as justification
In negative coherence theories, beliefs are prima facie justified, and don't need initial reasons [Harman, by Pollock/Cruz]
In revision of belief, we need to keep track of justifications for foundations, but not for coherence [Harman]
Coherence is intelligible connections, especially one element explaining another [Harman]
13. Knowledge Criteria / B. Internal Justification / 5. Coherentism / b. Pro-coherentism
Coherence avoids scepticism, because it doesn't rely on unprovable foundations [Harman]
13. Knowledge Criteria / C. External Justification / 8. Social Justification
If you would deny a truth if you know the full evidence, then knowledge has social aspects [Harman, by Sosa]
14. Science / B. Scientific Theories / 1. Scientific Theory
Identities like 'heat is molecule motion' are necessary (in the highest degree), not contingent [Kripke]
14. Science / C. Induction / 1. Induction
Enumerative induction is inference to the best explanation [Harman]
14. Science / C. Induction / 2. Aims of Induction
Induction is an attempt to increase the coherence of our explanations [Harman]
14. Science / C. Induction / 3. Limits of Induction
Induction is 'defeasible', since additional information can invalidate it [Harman]
14. Science / C. Induction / 4. Reason in Induction
All reasoning is inductive, and deduction only concerns implication [Harman]
14. Science / D. Explanation / 3. Best Explanation / a. Best explanation
Best Explanation is the core notion of epistemology [Harman, by Smart]
15. Nature of Minds / A. Nature of Mind / 1. Mind / a. Mind
I regard the mind-body problem as wide open, and extremely confusing [Kripke]
15. Nature of Minds / A. Nature of Mind / 6. Anti-Individualism
There is no natural border between inner and outer [Harman]
We can only describe mental attitudes in relation to the external world [Harman]
15. Nature of Minds / B. Features of Minds / 5. Qualia / b. Qualia and intentionality
Qualities of experience are just representational aspects of experience ('Representationalism') [Harman, by Burge]
15. Nature of Minds / B. Features of Minds / 5. Qualia / c. Explaining qualia
The way things look is a relational matter, not an intrinsic matter [Harman]
16. Persons / C. Self-Awareness / 2. Knowing the Self
We see ourselves in the world as a map [Harman]
17. Mind and Body / A. Mind-Body Dualism / 7. Zombies
It seems logically possible to have the pain brain state without the actual pain [Kripke]
Identity theorists must deny that pains can be imagined without brain states [Kripke]
17. Mind and Body / B. Behaviourism / 2. Potential Behaviour
Defining dispositions is circular [Harman]
17. Mind and Body / E. Mind as Physical / 1. Physical Mind
Kripke assumes that mind-brain identity designates rigidly, which it doesn't [Armstrong on Kripke]
17. Mind and Body / E. Mind as Physical / 4. Connectionism
Could a cloud have a headache if its particles formed into the right pattern? [Harman]
17. Mind and Body / E. Mind as Physical / 7. Anti-Physicalism / e. Modal argument
If consciousness could separate from brain, then it cannot be identical with brain [Kripke, by Papineau]
Kripke says pain is necessarily pain, but a brain state isn't necessarily painful [Kripke, by Rey]
Identity must be necessary, but pain isn't necessarily a brain state, so they aren't identical [Kripke, by Schwartz,SP]
Identity theorists seem committed to no-brain-event-no-pain, and vice versa, which seems wrong [Kripke]
Pain, unlike heat, is picked out by an essential property [Kripke]
18. Thought / A. Modes of Thought / 5. Rationality / a. Rationality
Ordinary rationality is conservative, starting from where your beliefs currently are [Harman]
18. Thought / A. Modes of Thought / 10. Rule Following
No rule can be fully explained [Kripke]
'Quus' means the same as 'plus' if the ingredients are less than 57; otherwise it just produces 5 [Kripke]
18. Thought / B. Mechanics of Thought / 4. Language of Thought
Are there any meanings apart from in a language? [Harman]
18. Thought / B. Mechanics of Thought / 5. Mental Files
Puzzled Pierre has two mental files about the same object [Recanati on Kripke]
18. Thought / D. Concepts / 5. Concepts and Language / a. Concepts and language
Concepts in thought have content, but not meaning, which requires communication [Harman]
19. Language / A. Nature of Meaning / 1. Meaning
Speech acts, communication, representation and truth form a single theory [Harman]
19. Language / A. Nature of Meaning / 6. Meaning as Use
Take meaning to be use in calculation with concepts, rather than in communication [Harman]
The use theory attaches meanings to words, not to sentences [Harman]
19. Language / A. Nature of Meaning / 7. Meaning Holism / c. Meaning by Role
Meaning from use of thoughts, constructed from concepts, which have a role relating to reality [Harman]
Some regard conceptual role semantics as an entirely internal matter [Harman]
The content of thought is relations, between mental states, things in the world, and contexts [Harman]
19. Language / A. Nature of Meaning / 8. Synonymy
There is only similarity in meaning, never sameness in meaning [Harman]
19. Language / A. Nature of Meaning / 9. Ambiguity
Ambiguity is when different underlying truth-conditional structures have the same surface form [Harman]
19. Language / A. Nature of Meaning / 10. Denial of Meanings
Kripke's Wittgenstein says meaning 'vanishes into thin air' [Kripke, by Miller,A]
If you ask what is in your mind for following the addition rule, meaning just seems to vanish [Kripke]
19. Language / B. Reference / 1. Reference theories
The Electra: she knows this man, but not that he is her brother [Eucleides, by Diog. Laertius]
19. Language / B. Reference / 3. Direct Reference / a. Direct reference
Kripke derives accounts of reference and proper names from assumptions about worlds and essences [Stalnaker on Kripke]
Kripke has a definitional account of kinds, but not of naming [Almog on Kripke]
19. Language / B. Reference / 3. Direct Reference / b. Causal reference
The important cause is not between dubbing and current use, but between the item and the speaker's information [Evans on Kripke]
We may refer through a causal chain, but still change what is referred to [Kripke]
19. Language / B. Reference / 3. Direct Reference / c. Social reference
Kripke makes reference a largely social matter, external to the mind of the speaker [Kripke, by McGinn]
Kripke's theory is important because it gives a collective account of reference [Kripke, by Putnam]
We refer through the community, going back to the original referent [Kripke]
A description may fix a reference even when it is not true of its object [Kripke]
19. Language / B. Reference / 4. Descriptive Reference / b. Reference by description
Descriptive reference shows how to refer, how to identify two things, and how to challenge existence [Kripke, by PG]
It can't be necessary that Aristotle had the properties commonly attributed to him [Kripke]
Even if Gödel didn't produce his theorems, he's still called 'Gödel' [Kripke]
19. Language / C. Assigning Meanings / 6. Truth-Conditions Semantics
Community implies assertability-conditions rather than truth-conditions semantics [Kripke, by Hanna]
Truth in a language is explained by how the structural elements of a sentence contribute to its truth conditions [Harman]
19. Language / C. Assigning Meanings / 10. Two-Dimensional Semantics
Rigid designation creates a puzzle - why do some necessary truths appear to be contingent? [Kripke, by Maciŕ/Garcia-Carpentiro]
19. Language / D. Propositions / 1. Propositions
Sentences are different from propositions, since two sentences can express one proposition [Harman]
19. Language / E. Analyticity / 3. Analytic and Synthetic
The analytic/synthetic distinction is a silly division of thought into encyclopaedia and dictionary [Harman]
19. Language / F. Communication / 3. Denial
If one proposition negates the other, which is the negative one? [Harman]
19. Language / F. Communication / 4. Private Language
The sceptical rule-following paradox is the basis of the private language argument [Kripke, by Hanna]
19. Language / F. Communication / 6. Interpreting Language / a. Translation
Mastery of a language requires thinking, and not just communication [Harman]
19. Language / F. Communication / 6. Interpreting Language / b. Indeterminate translation
Many predicates totally resist translation, so a universal underlying structure to languages is unlikely [Harman]
22. Metaethics / C. The Good / 1. Goodness / b. Types of good
The chief good is unity, sometimes seen as prudence, or God, or intellect [Eucleides]
22. Metaethics / C. The Good / 1. Goodness / d. Good as virtue
Basing ethics on flourishing makes it consequentialist, as actions are judged by contributing to it [Harman]
22. Metaethics / C. The Good / 1. Goodness / g. Consequentialism
Maybe consequentialism is a critique of ordinary morality, rather than describing it [Harman]
22. Metaethics / C. The Good / 2. Happiness / b. Eudaimonia
What counts as 'flourishing' must be relative to various sets of values [Harman]
23. Ethics / C. Virtue Theory / 2. Elements of Virtue Theory / e. Character
Maybe there is no such thing as character, and the virtues and vices said to accompany it [Harman]
If a person's two acts of timidity have different explanations, they are not one character trait [Harman]
Virtue ethics might involve judgements about the virtues of actions, rather than character [Harman]
26. Natural Theory / B. Natural Kinds / 5. Reference to Natural Kinds
Terms for natural kinds are very close to proper names [Kripke]
The properties that fix reference are contingent, the properties involving meaning are necessary [Kripke]
26. Natural Theory / B. Natural Kinds / 6. Necessity of Kinds
Gold's atomic number might not be 79, but if it is, could non-79 stuff be gold? [Kripke]
'Cats are animals' has turned out to be a necessary truth [Kripke]
26. Natural Theory / B. Natural Kinds / 7. Critique of Kinds
Nominal essence may well be neither necessary nor sufficient for a natural kind [Kripke, by Bird]
26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / b. Scientific necessity
The scientific discovery (if correct) that gold has atomic number 79 is a necessary truth [Kripke]
Scientific discoveries about gold are necessary truths [Kripke]
Once we've found that heat is molecular motion, then that's what it is, in all possible worlds [Kripke]
26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / d. Knowing essences
Science searches basic structures in search of essences [Kripke]
27. Natural Reality / G. Biology / 5. Species
Tigers may lack all the properties we originally used to identify them [Kripke]
The original concept of 'cat' comes from paradigmatic instances [Kripke]
'Tiger' designates a species, and merely looking like the species is not enough [Kripke]