Theorem (proof that) a) A Delta B = AÚ B if A Subscription B

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Theorem (proof that) a) A Delta B = AÚ B if A Subscription B

Postby reza95 on Fri Mar 07, 2014 4:06 pm

Theorem (proof that)
a) A Delta B = AÚ B if A Subscription B= Null
b) A Subscription (B Ù C) = (A Subscription B) Ù (A Subscription C)

sorry for bad typing , I got error. better form : http://mathhelpforum.com/discrete-math/226661-theorem-proof.html#post812654
please help me.
thank you.
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Postby stapel_eliz on Fri Mar 07, 2014 6:02 pm

reza95 wrote:Theorem (proof that)
a) A Delta B = AÚ B if A Subscription B= Null
b) A Subscription (B Ù C) = (A Subscription B) Ù (A Subscription C)

What does "Delta" indicate? What does "Ú" mean? What does "Subscription" mean in this context? Does "Null" mean "the empty set"?

What are your thoughts? What have you tried? How far did you get? Where are you stuck?

Please be complete. Thank you! :wink:
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Re: Theorem (proof that) a) A Delta B = AÚ B if A Subscripti

Postby reza95 on Fri Mar 07, 2014 6:43 pm

I am so sorry , when I want right I get Error and can not submit my post.

Please visit : http://mathhelpforum.com/discrete-math/226661-theorem-proof.html
I writing right there.
thank you.
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Postby stapel_eliz on Fri Mar 07, 2014 7:19 pm

Okay; what does "" mean? What does "Ú" mean? Does "" mean "the empty set"?

Seriously: You have to tell people what you mean. And, before anybody can help you get un-stuck, you have to show what you've tried so far.

Please be complete. Thank you.
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