Combining Texts

Ideas for 'Events and Their Names', 'Truth by Convention' and 'What is Logic?'

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12 ideas

5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

13845

The various logics are abstractions made from terms like 'if...then' in English [Hacking]

5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic

13840

First-order logic is the strongest complete compact theory with Löwenheim-Skolem [Hacking]

13844

A limitation of first-order logic is that it cannot handle branching quantifiers [Hacking]

5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

13842

Second-order completeness seems to need intensional entities and possible worlds [Hacking]

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

10064

Quine quickly dismisses If-thenism [Quine, by Musgrave]

5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention

20296

Logic needs general conventions, but that needs logic to apply them to individual cases [Quine, by Rey]

8998	Claims that logic and mathematics are conventional are either empty, uninteresting, or false [Quine]

8999	Logic isn't conventional, because logic is needed to infer logic from conventions [Quine]

9000	If a convention cannot be communicated until after its adoption, what is its role? [Quine]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

13837

With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

13839

Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking]

5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems

13843

If it is a logic, the Löwenheim-Skolem theorem holds for it [Hacking]