[討論] 關于構造邏輯
在構造邏輯(非經典邏輯)中,排中律是不可用的,即未必P和not(P)有一個必為真。
由此,可以知not(not(P))無法推出P(即傳統的反證法不成立)。但是,
not(not(not(P)))卻可以推出not(P)。還有,如果P能推出R,not(P)也能推出R,
那么我們可以得出結論,not(not(R))成立(R卻不必然成立)。太神奇了!
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 124.77.89.116
※ 文章網址: https://www.ptt.cc/bbs/logic/M.1423026514.A.572.html
推
02/04 16:32, , 1F
02/04 16:32, 1F
→
02/04 16:51, , 2F
02/04 16:51, 2F
推
02/04 16:54, , 3F
02/04 16:54, 3F
→
02/04 16:54, , 4F
02/04 16:54, 4F
推
02/04 21:03, , 5F
02/04 21:03, 5F
→
02/04 21:18, , 6F
02/04 21:18, 6F
→
02/04 21:19, , 7F
02/04 21:19, 7F
推
02/04 21:28, , 8F
02/04 21:28, 8F
推
02/06 02:30, , 9F
02/06 02:30, 9F
→
02/06 02:31, , 10F
02/06 02:31, 10F
→
02/06 02:31, , 11F
02/06 02:31, 11F
→
02/06 02:31, , 12F
02/06 02:31, 12F
→
02/06 02:32, , 13F
02/06 02:32, 13F
→
02/06 02:32, , 14F
02/06 02:32, 14F
→
02/06 02:32, , 15F
02/06 02:32, 15F
→
02/06 02:33, , 16F
02/06 02:33, 16F
→
02/06 02:33, , 17F
02/06 02:33, 17F
→
02/06 02:33, , 18F
02/06 02:33, 18F
推
02/06 13:08, , 19F
02/06 13:08, 19F
→
02/06 13:09, , 20F
02/06 13:09, 20F
→
02/06 13:10, , 21F
02/06 13:10, 21F
→
02/06 18:26, , 22F
02/06 18:26, 22F
推
02/06 21:13, , 23F
02/06 21:13, 23F
→
02/06 21:15, , 24F
02/06 21:15, 24F
→
02/06 21:15, , 25F
02/06 21:15, 25F
→
02/06 21:15, , 26F
02/06 21:15, 26F
→
02/06 21:15, , 27F
02/06 21:15, 27F
→
02/06 21:16, , 28F
02/06 21:16, 28F
→
02/06 21:16, , 29F
02/06 21:16, 29F
→
02/06 21:17, , 30F
02/06 21:17, 30F
→
02/06 21:17, , 31F
02/06 21:17, 31F
→
02/06 21:18, , 32F
02/06 21:18, 32F
→
02/06 21:18, , 33F
02/06 21:18, 33F
→
02/06 21:19, , 34F
02/06 21:19, 34F
推
02/06 21:31, , 35F
02/06 21:31, 35F
→
02/06 21:31, , 36F
02/06 21:31, 36F
→
02/06 21:31, , 37F
02/06 21:31, 37F
→
02/06 21:32, , 38F
02/06 21:32, 38F
→
02/06 21:32, , 39F
02/06 21:32, 39F
→
02/06 21:33, , 40F
02/06 21:33, 40F
推
02/06 23:33, , 41F
02/06 23:33, 41F
→
02/06 23:35, , 42F
02/06 23:35, 42F
→
02/06 23:37, , 43F
02/06 23:37, 43F
→
02/06 23:38, , 44F
02/06 23:38, 44F
推
02/07 01:39, , 45F
02/07 01:39, 45F
→
02/07 01:39, , 46F
02/07 01:39, 46F
→
02/07 01:40, , 47F
02/07 01:40, 47F
→
02/07 01:40, , 48F
02/07 01:40, 48F
→
02/07 01:41, , 49F
02/07 01:41, 49F
→
02/07 01:41, , 50F
02/07 01:41, 50F
→
02/07 01:41, , 51F
02/07 01:41, 51F
推
02/07 11:51, , 52F
02/07 11:51, 52F
→
02/07 11:51, , 53F
02/07 11:51, 53F
→
02/07 11:54, , 54F
02/07 11:54, 54F
→
02/07 11:54, , 55F
02/07 11:54, 55F
推
02/09 22:36, , 56F
02/09 22:36, 56F
討論串 (同標題文章)