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coldnumber
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Second-year grad student somewhere.

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18
Prove that $(\mathbb{Z}_n , +)$, the integers $\pmod{n}$ under addition, is a group.
Jul 25, 2015
answer
13
If $A$ is an $m\times n$ matrix, $B$ is an $n\times m$ matrix and $n<m$, then $AB$ is not invertible.
Aug 5, 2015
answer
11
Noncyclic Abelian Group of order 51
Jul 8, 2015
answer
8
How do I verify that a line is parallel to a plane?
Jul 21, 2015
answer
8
Understanding Direct Sum
Aug 5, 2015
answer
7
Determining the minimal polynomial over $\Bbb{Q}$
Aug 10, 2015
answer
5
Tangent line parallel to another line
Jul 23, 2015
answer
5
Confused by inductive proof of associative law
Jul 26, 2015
answer
5
How do I proceed with this proof about order of elements in a group G?
Jul 15, 2015
answer
5
Number of left cosets equals number of right cosets?
Aug 4, 2015