Combining Philosophers

Ideas for Mary Astell, Charles Sanders Peirce and David Wiggins

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8 ideas

5. Theory of Logic / A. Overview of Logic / 3. Value of Logic

14780

Only study logic if you think your own reasoning is deficient [Peirce]

5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=

19237

Deduction is true when the premises facts necessarily make the conclusion fact true [Peirce]

5. Theory of Logic / C. Ontology of Logic / 1. Ontology of Logic

19256

Our research always hopes that reality embodies the logic we are employing [Peirce]

5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism

21493

Pure mathematics deals only with hypotheses, of which the reality does not matter [Peirce]

14783

Logic, unlike mathematics, is not hypothetical; it asserts categorical ends from hypothetical means [Peirce]

5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence

19102

Bivalence is a regulative assumption of enquiry - not a law of logic [Peirce, by Misak]

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

19238

The logic of relatives relies on objects built of any relations (rather than on classes) [Peirce]

5. Theory of Logic / F. Referring in Logic / 3. Property (λ-) Abstraction

11863

(λx)[Man x] means 'the property x has iff x is a man'. [Wiggins]