28

Questions

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28

votes

3

answers

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Why do finite homotopy groups imply finite homology groups?

at.algebraic-topology homotopy-theory gn.general-topology

dec 21 09 at 3:54 Allen Hatcher 7,169●2●26●35

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18

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12

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5k

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Why are tensors a generalization of scalars, vectors, and matrices?

linear-algebra big-picture tensor-products soft-question

may 9 at 15:37 Trevor 1

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12

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3

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941

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What determines a model structure?

homotopy-theory model-categories at.algebraic-topology

jun 27 10 at 18:17 roger123 1,652●5●19

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11

votes

6

answers

2k

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How should one think about sheafification and the difference between a sheaf and a presheaf

sheaf-theory topos-theory ag.algebraic-geometry big-picture

nov 9 10 at 16:36 roy smith 4,871●34●28

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10

votes

4

answers

528

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Algebraic analogue of the Moebius bundle over the circle

ag.algebraic-geometry vector-bundles ac.commutative-algebra

nov 9 10 at 17:39 Paul Yuryev 289●1●7

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10

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2

answers

1k

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Galois theory and rational points on elliptic curves

nt.number-theory galois-representations elliptic-curves

jan 2 10 at 3:50 Anweshi 4,226●2●25●56

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8

votes

2

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975

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Galois group of a product of polynomials

ra.rings-and-algebras abstract-algebra polynomials galois-representations

mar 27 10 at 17:00 Charles Stewart 1,669●8●15

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8

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2

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1k

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Wikipedia’s definition of ‘locally free sheaf’

ac.commutative-algebra ag.algebraic-geometry modules sheaf-theory

oct 12 11 at 11:49 Abraham Tekle 1

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7

votes

2

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333

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Swan like theorem and covering spaces

at.algebraic-topology vector-bundles gt.geometric-topology

oct 28 10 at 8:57 roger123 1,652●5●19

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7

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2

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471

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Geometric motivation for the Stanley-Reisner correspondence

ag.algebraic-geometry ac.commutative-algebra co.combinatorics

jan 22 11 at 15:53 Jeremy Martin 585●2●8