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10-100頁 例67
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yckuo
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Nov 6, 2013, 3:59:55 AM
11/6/13
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to zjh...@googlegroups.com
There is exactly one person whom everybody loves.
∃x [
∀y L(x,y)
∀z [
∀w L(w,z) → z = x ] ]
想問最後
∀w L(w,z) → z = x
若將
→
改成
↔
變成
∀w L(w,z)
↔
z = x
為何不對?
林立宇
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Nov 6, 2013, 11:31:03 AM
11/6/13
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to zjh...@googlegroups.com
也對, 只不過不用寫到那麼強
因為前面那句話已經有imply了右邊到左邊的事實
因此只要左邊到右邊就可以了
畢竟後面這句重點只是想說明為一性
也就是說如果有人被所有人愛, 那個人就會是 x
並不是想強調所有人都愛 x
dason
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Nov 7, 2015, 11:55:25 PM
11/7/15
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to 黃子嘉 - 線代離散研究室
老師想請教一下後面那句話是在講唯一性,如果有人被所有人愛, 那個人就會是 x
那是不是
∀z 應該改成
∃
z 會比較好~~??
林立宇
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Dec 2, 2015, 8:26:33 AM
12/2/15
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to 黃子嘉 - 線代離散研究室
不, 應該寫 for all
(雖然寫"有人"感覺像是存在, 那是中文的說法)
因為要強調的是所有滿足那個條件的人, 一定就是 x
如果只寫存在, 那會演變成 x 就會使得這句話成立
這樣寫就多餘了
陳奕遠
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Oct 31, 2018, 8:18:44 AM
10/31/18
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to 黃子嘉 - 線代離散研究室
老師同學好,
請問把解答:
∃x [
∀y L(y,x)
∀z [
∀w L(w,z) → z = x ] ]
寫成:
∃x,
∀y
[
L(y,x)
∀z [
L(y,z) → z = x ] ]
可以嗎??
感覺
∀w
可直接用
∀y
表示,不需要另立一個變數
林立宇
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Jan 4, 2019, 2:40:40 AM
1/4/19
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to 黃子嘉 - 線代離散研究室
不可以, 你這樣寫的話會變成所有人 (y) 只能愛 x 一個人
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Joe J
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Sep 1, 2019, 12:48:40 AM
9/1/19
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to 黃子嘉 - 線代離散研究室
老師同學好,相同的問題想請問若改成
∃x, ∀y [ L(y, x) ^ ( ∀z L(z, y) ) → y = x ]
是否正確?
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