Timeline for Math puzzles for dinner
Current License: CC BY-SA 2.5
2 events
| when toggle format | what | by | license | comment | |
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| Sep 30, 2015 at 13:01 | comment | added | Gareth McCaughan | The answer to 3 surprised me, as did the brevity of the proof I found: Ercerfrag n crezhgngvba bs {1,...,a} ol, re, n crezhgngvba bs {1,...,a} nf sbyybjf: Jevgr qbja gur ryrzragf bs vgf plpyrf, rnpu plpyr ortvaavat jvgu vgf fznyyrfg ryrzrag, plpyrf va qrfpraqvat beqre bs gung fznyyrfg ryrzrag. Rirel crezhgngvba C bs {1,...,a} vf gur abgngvba sbe n havdhr crezhgngvba D bs {1,...,a}. Gur plpyr va D gung pbagnvaf 1 ortvaf jurerire 1 nccrnef va C naq pbagvahrf gb gur raq bs C; gurersber gung plpyr pbagnvaf 2 vss 1 cerprqrf 2 va C, naq jr'er qbar. | |
| Jun 25, 2010 at 19:17 | history | answered | Richard Stanley | CC BY-SA 2.5 |