Combining Philosophers

Ideas for Eubulides, Euclid and John P. Burgess

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6 ideas

4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / c. Derivations rules of PC

13907

If you pick an arbitrary triangle, things proved of it are true of all triangles [Euclid, by Lemmon]

4. Formal Logic / D. Modal Logic ML / 6. Temporal Logic

15413

With four tense operators, all complex tenses reduce to fourteen basic cases [Burgess]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

15415

The temporal Barcan formulas fix what exists, which seems absurd [Burgess]

4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic

15430

Is classical logic a part of intuitionist logic, or vice versa? [Burgess]

15431

It is still unsettled whether standard intuitionist logic is complete [Burgess]

4. Formal Logic / E. Nonclassical Logics / 5. Relevant Logic

15429

Relevance logic's → is perhaps expressible by 'if A, then B, for that reason' [Burgess]