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flat when the right-exact "tensor by $M$" functor becomes left exact (and therefore exact). This applies to $A$-algebras as the latter are $A$-module, saying that $B$ flat over $A$…
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created Jan 22 at 10:47
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An simple graph has a symmetric matrix L = D - A associated with it called the Laplacian matrix, where D is the diagonal matrix of degrees and A is the adjacency matrix, often studied for its spectrum…
created Jan 21 at 18:07
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For questions about the geometry, complex-analytic, and group-theoretic properties of the Mobius transformations (linear fractional transformations) $z \mapsto \frac{az + b}{cz + d}$ of the complex pl…
created Jan 17 at 2:32
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software for symbolic computation, numeric computation, and typesetting of texts involving mathematical notation.
created Jan 3 at 17:47
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created Dec 31 '14 at 21:20
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Ordered sets have a natural topology generated by the open intervals. This tag is meant for questions about this topology.
created Dec 30 '14 at 14:19
the category of subgroups of $P$ and injective group homomorphisms induced by conjugation in $P$. Example topics include control of fusion, blocks, centric and ra…
created Dec 15 '14 at 7:44
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For questions regarding groups of even prime power order, as distinct from p-groups in general. Topics include 2-groups of maximal class, 2-groups as Sylow subgroups, and the conjecture that almost al…
created Dec 15 '14 at 7:44