10 ideas
9540 | A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell] |
9541 | The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell] |
9543 | The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell] |
9544 | A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell] |
18969 | How do you distinguish three beliefs from four beliefs or two beliefs? [Quine] |
18967 | A 'proposition' is said to be the timeless cognitive part of the meaning of a sentence [Quine] |
18968 | The problem with propositions is their individuation. When do two sentences express one proposition? [Quine] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
18970 | The concept of a 'point' makes no sense without the idea of absolute position [Quine] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |