Viewing a response to: @douglas.adams/re-complexring-re-complexring-cryptography-101-an-interactive-class-an-introduction-to-group-theory--week-1-20160622t021243741z
<html> <p>1) Associativity can be taken from the integers, since we know the integers are associative, a subset of them will be as well. Inverses we do not automatically obtain, but it is obvious that if g = 2k in 2Z, for k in Z, then -g = -2k is also in 2Z. But, we need to explicitly state that and verify that it's the case.</p> <p>Closure is done correctly. Good job!</p> <p>2) Correct. </p> 95/100, since you didn't explicitly state how the inverse of an even integer is also even. </html>
| author | complexring |
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Oh, ok. Thanks
| author | douglas.adams |
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