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2d
reviewed Edit suggested edit on How find this system $a^2+b^2=3,a^2+c^2+ac=4,b^2+c^2+\sqrt{3}bc=7$
2d
revised How find this system $a^2+b^2=3,a^2+c^2+ac=4,b^2+c^2+\sqrt{3}bc=7$
General formatting
Mar
28
awarded  Custodian
Mar
28
reviewed Edit suggested edit on How to get a sum on a recursive infinite progression?
Mar
28
revised How to get a sum on a recursive infinite progression?
used standard English terminology
Feb
9
comment $x^5-x^2+1$ is separable over all fields
Yes, the gcd is x+2 and x=-2 is a root mod 7.
Feb
9
answered $x^5-x^2+1$ is separable over all fields
Sep
28
awarded  Good Answer
Sep
26
awarded  Nice Answer
Sep
26
answered Surprising identities / equations
Aug
1
awarded  Necromancer
Jun
4
awarded  Yearling
Dec
27
comment Consider the sequence 01110100…
Look for DeBruijn sequences or Huffman code.
Dec
23
comment Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?
Oh, I see, it is not the usual braid group, but on the sphere.
Dec
23
comment Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?
What if you add n+1 strand so that there is no interaction with the n-braid?
Dec
21
comment Interesting GRE problem
There is a root between 74 and 75.
Dec
19
comment Axiomatic characterization of the rational numbers
Smallest field containing the natural numbers.
Dec
18
comment Find the rotation axis and angle of a matrix
As a start, find the eigenvector with eigenvalue 1.
Dec
16
comment Peculiar presentation of Symmetric group of degree 10
The presentation seems garbled and the obvious fix makes it the trivial group.
Dec
16
comment Subgroups in $S_4$ are normal or not
How does the cycle structure of an element $x$ relate to the cycle structure of $axa^{-1}$?