tag:blogger.com,1999:blog-3839634717377760340.post5629867960511472226..comments2024-02-26T02:25:19.876-08:00Comments on 謝宗翰的隨筆 : [數學分析] 什麼是若且唯若 "if and only if" C. H. Hsiehhttp://www.blogger.com/profile/18005098064728038131noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-3839634717377760340.post-59025004793765264872021-06-02T10:02:00.000-07:002021-06-02T10:02:00.000-07:00那只是假設吧 你也可自行改成true
那只是假設吧 你也可自行改成true<br />Anonymoushttps://www.blogger.com/profile/07790654140321251308noreply@blogger.comtag:blogger.com,1999:blog-3839634717377760340.post-87606114303441644672020-08-25T00:53:03.577-07:002020-08-25T00:53:03.577-07:00我感覺可以更簡單地說,A同B是正比關係。如果a增加,b也增加,如果a減少,b就減少。如果b減少a也減...我感覺可以更簡單地說,A同B是正比關係。如果a增加,b也增加,如果a減少,b就減少。如果b減少a也減少, 如果b增加,a也增加。這樣解釋可以嗎?Helperhttps://www.blogger.com/profile/09991696689689367788noreply@blogger.comtag:blogger.com,1999:blog-3839634717377760340.post-62977557257149852842019-12-30T23:05:14.958-08:002019-12-30T23:05:14.958-08:00A only if B, only if B then A,
"只有"在B成立...A only if B, only if B then A,<br />"只有"在B成立時A成立 , 所以B不成立時A就不成立, A成立這個結果就隱含了B true.<br /><br />筆記整理得很清晰好懂, 謝謝分享.jiajiahttps://www.blogger.com/profile/06980955985397913667noreply@blogger.comtag:blogger.com,1999:blog-3839634717377760340.post-84872136594761095352019-10-21T21:47:20.085-07:002019-10-21T21:47:20.085-07:00還是不懂"If B is not true, then A is also not tru...還是不懂"If B is not true, then A is also not true".是怎麼出來的<br />又如何推得 所以如果已知 A is true, 那麼按照上句不難推得 B is also true<br /><br />only if 為甚麼可以變成not true啊 yoyohttps://www.blogger.com/profile/15665740989549254848noreply@blogger.com