4 ideas
18465 | An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen] |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
16745 | No one even knows the nature and properties of a fly - why it has that colour, or so many feet [Bacon,R] |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |