Combining Texts

All the ideas for 'Logical Consequence', 'Subjective View: sec qualities and indexicals' and 'Symbolic Logic (with Langford)'

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28 ideas

4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic
10688 'Equivocation' is when terms do not mean the same thing in premises and conclusion [Beall/Restall]
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
10690 Formal logic is invariant under permutations, or devoid of content, or gives the norms for thought [Beall/Restall]
5. Theory of Logic / B. Logical Consequence / 2. Types of Consequence
10691 Logical consequence needs either proofs, or absence of counterexamples [Beall/Restall]
5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=
10695 Logical consequence is either necessary truth preservation, or preservation based on interpretation [Beall/Restall]
5. Theory of Logic / B. Logical Consequence / 8. Material Implication
10689 A step is a 'material consequence' if we need contents as well as form [Beall/Restall]
5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
10696 A 'logical truth' (or 'tautology', or 'theorem') follows from empty premises [Beall/Restall]
5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
10693 Models are mathematical structures which interpret the non-logical primitives [Beall/Restall]
6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics
10692 Hilbert proofs have simple rules and complex axioms, and natural deduction is the opposite [Beall/Restall]
7. Existence / D. Theories of Reality / 2. Realism
22427 To explain object qualities, primary qualities must be more than mere sources of experience [McGinn]
10. Modality / B. Possibility / 8. Conditionals / a. Conditionals
7803 Modal logic began with translation difficulties for 'If...then' [Lewis,CI, by Girle]
12. Knowledge Sources / B. Perception / 2. Qualities in Perception / b. Primary/secondary
22413 Being red simply consists in looking red [McGinn]
22415 Relativity means differing secondary perceptions are not real disagreements [McGinn]
22416 Phenomenalism is correct for secondary qualities, so scepticism is there impossible [McGinn]
22422 Maybe all possible sense experience must involve both secondary and primary qualities [McGinn]
22428 You understood being red if you know the experience involved; not so with thngs being square [McGinn]
12. Knowledge Sources / B. Perception / 2. Qualities in Perception / c. Primary qualities
22414 You don't need to know how a square thing looks or feels to understand squareness [McGinn]
22423 Touch doesn't provide direct experience of primary qualities, because touch feels temperature [McGinn]
22426 We can perceive objectively, because primary qualities are not mind-created [McGinn]
12. Knowledge Sources / B. Perception / 2. Qualities in Perception / d. Secondary qualities
22412 Lockean secondary qualities (unlike primaries) produce particular sensory experiences [McGinn]
22421 Could there be a mind which lacked secondary quality perception? [McGinn]
22424 Secondary qualities contain information; their variety would be superfluous otherwise [McGinn]
22425 The utility theory says secondary qualities give information useful to human beings [McGinn]
12. Knowledge Sources / B. Perception / 3. Representation
7629 We see objects 'directly' by representing them [McGinn]
18. Thought / A. Modes of Thought / 9. Indexical Thought
18410 Indexical thought is in relation to my self-consciousness [McGinn]
22417 Indexicals do not figure in theories of physics, because they are not explanatory causes [McGinn]
22420 The indexical perspective is subjective, incorrigible and constant [McGinn]
18402 Indexical concepts are indispensable, as we need them for the power to act [McGinn]
19. Language / C. Assigning Meanings / 9. Indexical Semantics
22418 I can know indexical truths a priori, unlike their non-indexical paraphrases [McGinn]