Elements in a table

DgrayMan · **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?

Shadow · **Posted:** Tue, 31 Jan 2012 23:46:29 UTC

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.

DgrayMan · **Joined:** Sat, 21 Jan 2012 03:59:22 UTC **Posts:** 182

so for example either ab=e or ac=e?

Shadow · **Posted:** Wed, 1 Feb 2012 00:15:47 UTC

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.

DgrayMan · **Joined:** Sat, 21 Jan 2012 03:59:22 UTC **Posts:** 182

Gotcha!

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Elements in a table

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