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July 17th, 2013, 11:52 AM   #1
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Why my solution is different from sample solution?

Hello.

When I solved problem I found that my solution is different from one in textbook. I am wondering if I am doing anything wrong or if sample solution is wrong.

Task: Prove equality by using definition.


My solution.

1)We have to show that

2)Let . Implications are valid\

3)(provided that so ). By taking ,we get


Sample solution
1)We have to show that

2)Let . Implications are valid\

3)(provided that so ). By taking ,we get


Only difference is that sample solition has - where I have + and + where I have -. Is there any reason why sample solution should have - instead of + or is it just they're typo?
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July 17th, 2013, 12:28 PM   #2
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Re: Why my solution is different from sample solution?

It looks like a typo.
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