Mathematics
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Math Gems
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All Questions Answers
Score Newest
answer
48
Formal proof for $(-1) \times (-1) = 1$
Feb 15, 2013
answer
37
How did Euler prove the Mersenne number $2^{31}-1$ is a prime so early in history?
Mar 22, 2013
answer
37
If $a^3 =a$ for all $a$ in a ring $R$, then $R$ is commutative.
Jan 31, 2013
answer
34
Where does the word "torsion" in algebra come from?
Feb 11, 2013
answer
33
Why is every answer of $5^k - 2^k$ divisible by 3?
Apr 25, 2013
answer
31
Commutative property of ring addition
Mar 30, 2013
answer
30
How to prove the divisibility rule for $3\, $ [casting out threes]
Apr 28, 2013
answer
27
Polynomial: $p(x) = p(x+3)$.
Mar 24, 2013
answer
27
Changing a number between arbitrary bases
Feb 20, 2012
answer
27
In a group we have $abc=cba$. Is it abelian?
Feb 10, 2013

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