Mathematics
Boris Novikov's user avatar
Boris Novikov's user avatar
Boris Novikov's user avatar
Boris Novikov
  • Member for 10 years, 9 months
  • Last seen more than 9 years ago
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View all questions and answers
All Questions Answers
Score Newest
answer
45
Prove that the additive group $ℚ$ is not isomorphic with the multiplicative group $ℚ^*$.
Mar 19, 2013
answer
43
Why is $\frac{987654321}{123456789} = 8.0000000729?!$
May 19, 2013
answer
24
if $ab=cd$ then $a+b+c+d $ is composite
May 6, 2013
answer
15
Prove that $(G, \circ)$ is a group if $a\circ x = b$ and $x\circ a = b$ have unique solutions
Mar 30, 2013
answer
15
Good math bed-time stories for children?
Nov 7, 2013
answer
14
Concept of a subring in Atiyah-Macdonald's book
Sep 24, 2013
answer
13
$G$ is Abelian if it has no element of order $2$ and $(ab)^2=(ba)^2$
Nov 14, 2013
answer
13
Torsion Subgroup (Just a set) for an abelian (non abelian) group.
Aug 16, 2013
answer
11
Do Boolean rings always have a unit element?
May 14, 2013
answer
10
Groups of order 2k have a normal subgroup of order k and odd permutations
Jul 6, 2013
Top network posts
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20
Getting nervous refereeing a paper
19
About sets with two mutually associative group structures
13
Papers better than books?
12
Why aren't representations of monoids studied so much?
10
Mathematical Paper That Just Links Two Different Fields of Sciences

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