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 Post subject: Elements in a tablePosted: Tue, 31 Jan 2012 23:44:33 UTC
 S.O.S. Oldtimer

Joined: Sat, 21 Jan 2012 03:59:22 UTC
Posts: 182
Question #5

i'm confused as usual. i know in each row and column cannot have the same element twice. but if aa=e and bb does not equal e then wont e be in a row or column twice?

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 Post subject: Re: Elements in a tablePosted: Tue, 31 Jan 2012 23:46:29 UTC
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Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12168
Location: Austin, TX
DgrayMan wrote:
Question #5

i'm confused as usual. i know in each row and column cannot have the same element twice. but if aa=e and bb does not equal e then wont e be in a row or column twice?

If you're doing number 4, then all of them have xx=e, so bb=e is guaranteed.

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 Post subject: Re: Elements in a tablePosted: Tue, 31 Jan 2012 23:55:22 UTC
 S.O.S. Oldtimer

Joined: Sat, 21 Jan 2012 03:59:22 UTC
Posts: 182
so for example either ab=e or ac=e?

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 Post subject: Re: Elements in a tablePosted: Wed, 1 Feb 2012 00:15:47 UTC
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Joined: Wed, 30 Mar 2005 04:25:14 UTC
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Location: Austin, TX
DgrayMan wrote:
so for example either ab=e or ac=e?

No, that's not possible, inverses are unique, a is its own inverse, as is c its own, and b its own.

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 Post subject: Re: Elements in a tablePosted: Wed, 1 Feb 2012 18:18:52 UTC
 S.O.S. Oldtimer

Joined: Sat, 21 Jan 2012 03:59:22 UTC
Posts: 182
Gotcha!

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