Bruno Stonek

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How is a group made up of simple groups?

abstract-algebra group-theory asked Mar 6, 2011 at 17:09

math.stackexchange.com

62 votes

Center-commutator duality

abstract-algebra group-theory asked Mar 10, 2011 at 19:08

math.stackexchange.com

45 votes

Equivalent conditions for a preabelian category to be abelian

category-theory abelian-categories asked Jun 12, 2011 at 20:54

math.stackexchange.com

45 votes

Quotient objects, their universal property and the isomorphism theorems

abstract-algebra category-theory asked Aug 31, 2011 at 22:53

math.stackexchange.com

37 votes

Is the Schrödinger equation derived or postulated?

quantum-mechanics schroedinger-equation asked Jun 21, 2012 at 16:50

physics.stackexchange.com

35 votes

Footnote to a footnote

footnotes nesting asked Jul 15, 2011 at 23:40

tex.stackexchange.com

35 votes

If $\sum a_n b_n <\infty$ for all $(b_n)\in \ell^2$ then $(a_n) \in \ell^2$

functional-analysis hilbert-spaces asked May 7, 2011 at 16:44

math.stackexchange.com

34 votes

Are the axioms for abelian group theory independent?

group-theory logic asked Aug 6, 2011 at 21:49

math.stackexchange.com

31 votes

Freyd-Mitchell's embedding theorem

reference-request ct.category-theory ra.rings-and-algebras homological-algebra asked Nov 30, 2010 at 2:09

mathoverflow.net

30 votes

What is, really, the stable homotopy category?

at.algebraic-topology asked Jan 11, 2016 at 12:46

mathoverflow.net

Top Answers

Most harmful heuristic?

mathoverflow.net

What are the most overpowered theorems in mathematics?

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Categorical introduction to Algebra and Topology

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Best Sets of Lecture Notes and Articles

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Why is associativity required for groups?

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What does "extend linearly" mean in linear algebra?

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How many connected components does $\mathrm{GL}_n(\mathbb R)$ have?

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If $\sum a_n b_n <\infty$ for all $(b_n)\in \ell^2$ then $(a_n) \in \ell^2$

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Every $R$-module is free $\implies$ $R$ is a division ring

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What is the set of all functions from $\{0, 1\}$ to $\mathbb{N}$ equinumerous to?

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Splicing together Short Exact Sequences

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Good Pairs in Algebraic Topology

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Reference for Algebraic Geometry

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Ideal as a projective module

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Construction of a Hausdorff space from a topological space

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What is the suspension used in the Freudenthal suspension theorem?

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Duality between Tor and Ext?

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Can the indexing set of a cartesian product have the cardinality of the continuum?

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Problem in understanding set theory

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Any compact embedded $2$-dimensional hypersurface in $\mathbb R^3$ has a point of positive Gaussian curvature

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Morphism induced by a cellular map between CW-complexes

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Are free modules injective?

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Which one result in mathematics has surprised you the most?

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Explanation of term "closed under" in the definition of a sigma algebra?

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$\mathrm{Spec}(R)\!=\!\mathrm{Max}(R)\!\cup\!\{0\}$ $\Rightarrow$ $R$ is a PID

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What exactly is a neighborhood of the diagonal on a topological space?

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What's bad about left $\mathbb{H}$-modules?

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Is there a less ad hoc way to find the degree of this extension?

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Composition and one factor are monomorphisms, is the other factor mono?

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Is complex exact if its Euler characteristic is zero?

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Bruno Stonek

How is a group made up of simple groups?

Center-commutator duality

Equivalent conditions for a preabelian category to be abelian

Quotient objects, their universal property and the isomorphism theorems

Is the Schrödinger equation derived or postulated?

Footnote to a footnote

If $\sum a_n b_n <\infty$ for all $(b_n)\in \ell^2$ then $(a_n) \in \ell^2$

Are the axioms for abelian group theory independent?

Freyd-Mitchell's embedding theorem

What is, really, the stable homotopy category?