/sci/ - Science & Math » Thread #10982935

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Anonymous Wed 18 Sep 14:49:02 2019 No.10982935 View Reply Original Report

Quoted By: >>10983061

Is this true or false?

Anonymous

Anonymous Wed 18 Sep 2019 16:01:16 No.10983061 Report

Quoted By: >>10983083

>>10982935
if x and Y are the same then it's true

Anonymous

Anonymous Wed 18 Sep 2019 16:14:13 No.10983083 Report

Quoted By: >>10983087 >>10983130

>>10983061
It literally begins with "For ANY X", though.

Anonymous

Anonymous Wed 18 Sep 2019 16:18:05 No.10983087 Report

Quoted By:

>>10983083
for any x choose y that is equal to x

Anonymous

Anonymous Wed 18 Sep 2019 16:27:42 No.10983104 Report

Quoted By: >>10983432

It's false because X and Y can't be duplicate elements

Anonymous

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Anonymous Wed 18 Sep 2019 16:34:24 No.10983112 Report

Quoted By:

$\forall S.\, \forall (X \in S).\, \forall Y. \ X-Y = \{ \}$

Anonymous

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Anonymous Wed 18 Sep 2019 16:35:59 No.10983118 Report

Quoted By:

$\forall S.\, \forall (X \in S).\, \exists Y. \ X-Y = \{ \}$

Anonymous

Anonymous Wed 18 Sep 2019 16:42:11 No.10983130 Report

Quoted By:

>>10983083
It says "for all X, there exists a Y (which may depend on X)"
You're thinking of "there exists a Y such that for all X" which is much stronger.
However, in this case, both hold as demonstrated by Y = N.

Anonymous

Anonymous Wed 18 Sep 2019 18:47:10 No.10983432 Report

Quoted By:

>>10983104
they can

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