# HSN

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Did BSc in Chemistry and Mathematics, MSc in Maths. Recently started PhD at the university of Münster.

Quite aware of some more advanced topics, oblivious of some basic stuff.

When I give an answer, I attempt it to direct it at the person posing the original question and try to make it understandable, eg.:

• if someone asks something about equivalence relations, I won't easily talk about (projection) maps and pre-images.
• if someone asks about homotopy theory, I will assume a fair basic knowledge of topology.

 10 Prove that if $A$ is diagonalizable then there is a matrix $B$ such that $B^{2012} = A$ 5 Binomial coefficient proof 4 What is the importance of Jacobian Conjecture and any progress on it? 4 Proving a function is one to one 4 To what extent are morphisms required to be functions?

# 1,609 Reputation

 +5 Intuition for a certain tensor product. +5 Cocartesian squares in the category of abelian groups. +10 How: $(\vec b + \vec c)(\vec b - \vec c) = 0 \implies \frac{\vec b + \vec c}{2}.(\vec c - \vec b) = 0$ +15 Intermediate fields of Gal($x^5-2$, $\mathbb{Q}$)

# 8 Questions

 9 Intuition for a certain tensor product. 6 Finite group with elements of given order 4 Cocartesian squares in the category of abelian groups. 4 The zero set of $z_0^2+z_1^2-1$ in $\mathbb{C}^2$. 4 Repeated nested roots

# 80 Tags

 11 linear-algebra × 3 7 combinatorics × 5 9 functions × 4 7 binomial-coefficients × 4 7 reference-request × 6 7 binomial-theorem × 2 7 abstract-algebra × 6 6 polynomials × 7 7 manifolds × 6 6 algebraic-geometry × 2

# 2 Accounts

 Mathematics 1,609 rep 315 MathOverflow 101 rep 1