Ideas from 'Lectures 1930-32 (student notes)' by Ludwig Wittgenstein [1931], by Theme Structure

[found in 'Lectures in Cambridge 1930-32' by Wittgenstein,Ludwig (ed/tr Lee,Desmond) [Blackwell 1980,0-631-13167-1]].

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1. Philosophy / C. History of Philosophy / 1. History of Philosophy
The history of philosophy only matters if the subject is a choice between rival theories
1. Philosophy / D. Nature of Philosophy / 4. Aims of Philosophy / d. Philosophy as puzzles
Philosophical tries to be rid of certain intellectual puzzles, irrelevant to daily life
1. Philosophy / D. Nature of Philosophy / 6. Despair over Philosophy
Philosophers express puzzlement, but don't clearly state the puzzle
1. Philosophy / F. Analytic Philosophy / 1. Analysis
We already know what we want to know, and analysis gives us no new facts
1. Philosophy / F. Analytic Philosophy / 4. Ordinary Language
We don't need a theory of truth, because we use the word perfectly well
2. Reason / F. Fallacies / 8. Category Mistake / a. Category mistakes
Words of the same kind can be substituted in a proposition without producing nonsense
2. Reason / F. Fallacies / 8. Category Mistake / b. Category mistake as syntactic
Talking nonsense is not following the rules
Grammar says that saying 'sound is red' is not false, but nonsense
3. Truth / A. Truth Problems / 2. Defining Truth
There is no theory of truth, because it isn't a concept
3. Truth / C. Correspondence Truth / 1. Correspondence Truth
All thought has the logical form of reality
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
In logic nothing is hidden
5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention
Laws of logic are like laws of chess - if you change them, it's just a different game
5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
Contradiction is between two rules, not between rule and reality
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
We may correctly use 'not' without making the rule explicit
Negations are not just reversals of truth-value, since that can happen without negation
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and
Saying 'and' has meaning is just saying it works in a sentence
5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
A person's name doesn't mean their body; bodies don't sit down, and their existence can be denied
6. Mathematics / A. Nature of Mathematics / 3. Numbers / g. Real numbers
We don't get 'nearer' to something by adding decimals to 1.1412... (root-2)
6. Mathematics / A. Nature of Mathematics / 4. The Infinite / a. The Infinite
Infinity is not a number, so doesn't say how many; it is the property of a law
7. Existence / D. Theories of Reality / 7. Facts / b. Types of fact
There are no positive or negative facts; these are just the forms of propositions
8. Modes of Existence / D. Universals / 5. Universals as Concepts
Using 'green' is a commitment to future usage of 'green'
10. Modality / C. Sources of Modality / 3. Necessity by Convention
For each necessity in the world there is an arbitrary rule of language
11. Knowledge Aims / A. Knowledge / 2. Understanding
Understanding is translation, into action or into other symbols
12. Knowledge Sources / B. Perception / 4. Sense Data / a. Sense-data theory
We live in sense-data, but talk about physical objects
12. Knowledge Sources / B. Perception / 4. Sense Data / d. Sense-data problems
Part of what we mean by stating the facts is the way we tend to experience them
12. Knowledge Sources / E. Direct Knowledge / 3. Memory
If you remember wrongly, then there must be some other criterion than your remembering
14. Science / D. Explanation / 1. Explanation / b. Aims of explanation
Explanation and understanding are the same
Explanation gives understanding by revealing the full multiplicity of the thing
14. Science / D. Explanation / 2. Types of Explanation / h. Explanations by mechanism
A machine strikes us as being a rule of movement
14. Science / D. Explanation / 3. Best Explanation / a. Best explanation
If an explanation is good, the symbol is used properly in the future
18. Thought / A. Modes of Thought / 1. Thought
Thought is an activity which we perform by the expression of it
19. Language / B. Meaning / 3. Meaning as Verification
The meaning of a proposition is the mode of its verification
19. Language / B. Meaning / 6. Meaning as Truth-Conditions
A proposition draws a line around the facts which agree with it
19. Language / B. Meaning / 8. Meaning through Sentences
Words function only in propositions, like levers in a machine
19. Language / E. Propositions / 2. Nature of Propositions
A proposition is any expression which can be significantly negated
26. Natural Theory / D. Laws of Nature / 12. Against Laws of Nature
Laws of nature are an aspect of the phenomena, and are just our mode of description