Re: A set question...

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Article #277

#277

From: Joe
Date: Wed, 18 Jul 2001 17:37

21 lines
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Sorry for all, there are some mistakes in the original question...

1) A & ~B & ~C and ~( ~A | B | C ) are the same functions [because
DeMorgan's Law], and (A & ~B & ~C) | (A & B & ~C) is equal to A & ~C.

2) In the original question, I use the same symbol "0" to express "element
0" and "null set". The correct descriptions should be:

Line 12:
0             null set          =>        null        null set

Line 30:
f( A, B, C ) = ~A & ~C | 0   =>   f( A, B, C ) = ~A & ~C | null

3) Finally, because I don't know "syntax and semantics" much, so the
description:

> f( A, B, C )   set function, an expression of set operation that consist
> of symbols 'A', 'B', 'C', '&', ' | ', '~' and parentheses.

is confused. But I don't know how to correct it :(

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From: "Joe" <cf9403@kimo.com.tw>
Newsgroups: fj.education.math
Subject: Re: A set question...
Date: Thu, 19 Jul 2001 01:37:48 +0800
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