4 ideas
| 19695 | The devil was wise as an angel, and lost no knowledge when he rebelled [Whitcomb] |
| 13832 | Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking] |
| 16698 | Days exist, and yet they seem to be made up of parts which don't exist [Burley] |
| 16690 | Unlike permanent things, successive things cannot exist all at once [Burley] |