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seen Mar 28 at 1:04

May
5
comment What is the proper name of this class of rings?
I guess I would just call it "an integral domain of characteristic 0"... But your statement about polynomials is not true: $R$ could also be an infinite integral domain of characteristic $p$.
May
1
comment I need to diagonalize this matrix but I'm not sure it can be
It can't be diagonalized, since the matrix only has one eigenvector for the double eigenvalue. You should check out "Jordan Normal Form".
May
1
answered Is the following problem convex?
May
1
comment Is the following problem convex?
It's not true in general that a composition of two convex functions is convex. See this question
Mar
25
answered Is there a property that isolates the formulas that remain valid as you move from the natural numbers to the integers?
Mar
14
comment Shortest string possible
I would think it has to be 0100010. The shortest one can't have a substring that's also an instance of S.
Mar
14
comment Count indices in summation
I think inclusion-exclusion principle might help you.
Jul
28
awarded  Yearling
Jul
16
awarded  Nice Answer
Jul
29
awarded  Editor
Jul
29
revised Why is the “finitely many” quantifier not definable in First Order Logic?
Correction.
Jul
28
awarded  Teacher
Jul
28
answered Why is the “finitely many” quantifier not definable in First Order Logic?
Jul
27
awarded  Supporter