4 ideas
3299 | In logic identity involves reflexivity (x=x), symmetry (if x=y, then y=x) and transitivity (if x=y and y=z, then x=z) [Baillie] |
13007 | Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz] |
20890 | Why do sexual relationships need permanence, if other relationships don't? [Punzo] |
20891 | Does engaging in sexual intercourse really need no more thought than playing tennis? [Punzo] |