4 ideas
9123 | Someone standing in a doorway seems to be both in and not-in the room [Priest,G, by Sorensen] |
9987 | An aggregate in which order does not matter I call a 'set' [Bolzano] |
18844 | You would cripple mathematics if you denied Excluded Middle [Hilbert] |
10856 | A truly infinite quantity does not need to be a variable [Bolzano] |