假設有a,b,c三種屬性
如果all A is a.
那麼"A is a or b"這句是否成立?
To 忽必裂:
All A is a or b = All A is a or not a = All A is a or b or c
???
因A is a or b = A is not c
且all A is a only
所以A is a or b is true?
All A is a only
b is not a
All A is a or b = All A is a or not a
('All A is a or not a' is tautological and it is always true.)
Therefore 'All A is a or b' is true.
套套邏輯
參見 http://zh.wikipedia.org/wiki/%E9%87%8D%E8%A8%80%E5...
2010-04-03 17:08:10 補充:
根據我的論證,
All A is a or b = All A is a or not a 是正確的, 因為 b is not a.
但是,
All A is a or b or c 是否等于 All A is a or b = All A is a or not a 呢?
如果 b ≠ a, c ≠ a 及 c ≠ b,
2010-04-03 17:24:22 補充:
All A is a or b = All A is a or b or c 是錯的, 因為右邊多了一個 "or c"
________________________________________________________
如果你這個論證配合我的論證那就對。
我個人認為 A is a or b = A is not c 不太重要。
2010-07-01 18:26:24 補充:
不好意思,我 (忽必裂) 後來發現: All A is a or b = All A is a or b or c 是錯的, 因為右邊多了一個 "or c"——這句話是錯的。All A is a or b = All A is a or b or c 是對的。
“或” 的意思是 “是但一個”。我們可以在 “=" 兩邊各選出 ”All A is a“ 或 ”All A is b“,可以在 “=” 右邊不選出 ”All A is c"。
p→pvq
Axiom,or coz correct
當然成立
A is a or b指的, 係A is a or A is b. 所以呢2個都岩
這裏可以幫到你
http://yahootwiawwi.w13.twsjkj.com/yahoo.com.hk/hk...
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Answers & Comments
Verified answer
All A is a only
b is not a
All A is a or b = All A is a or not a
('All A is a or not a' is tautological and it is always true.)
Therefore 'All A is a or b' is true.
套套邏輯
參見 http://zh.wikipedia.org/wiki/%E9%87%8D%E8%A8%80%E5...
2010-04-03 17:08:10 補充:
根據我的論證,
All A is a or b = All A is a or not a 是正確的, 因為 b is not a.
但是,
All A is a or b or c 是否等于 All A is a or b = All A is a or not a 呢?
如果 b ≠ a, c ≠ a 及 c ≠ b,
2010-04-03 17:24:22 補充:
All A is a or b = All A is a or b or c 是錯的, 因為右邊多了一個 "or c"
________________________________________________________
因A is a or b = A is not c
且all A is a only
所以A is a or b is true?
如果你這個論證配合我的論證那就對。
我個人認為 A is a or b = A is not c 不太重要。
2010-07-01 18:26:24 補充:
不好意思,我 (忽必裂) 後來發現: All A is a or b = All A is a or b or c 是錯的, 因為右邊多了一個 "or c"——這句話是錯的。All A is a or b = All A is a or b or c 是對的。
“或” 的意思是 “是但一個”。我們可以在 “=" 兩邊各選出 ”All A is a“ 或 ”All A is b“,可以在 “=” 右邊不選出 ”All A is c"。
p→pvq
Axiom,or coz correct
當然成立
A is a or b指的, 係A is a or A is b. 所以呢2個都岩
這裏可以幫到你
http://yahootwiawwi.w13.twsjkj.com/yahoo.com.hk/hk...