Sam Derbyshire

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Name	Sam Derbyshire
Member for	5 months
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Location	Warwick University, United Kingdom
Age	20

Cohomology enthusiast.

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Famous mathematical quotes

feb 28 at 23:22 Qiaochu Yuan 11.9k●18●98

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“Philosophical” meaning of the Yoneda Lemma

ct.category-theory intuition

feb 13 at 7:45 Sridhar Ramesh 374●8

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701

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Explanation for the Chern character

cohomology characteristic-classes kt.k-theory-homology at.algebraic-topology

2d ago Peter Teichner 196●2●1

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333

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How do you relate the number of independent vector fields on spheres and Bott Periodicity for real K-Theory?

kt.k-theory-homology homotopy-theory vector-bundles clifford-algebras

mar 15 at 21:34 Dan Ramras 428●7

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answer

338

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Explanation for the Thom-Pontryagin construction (and its generalisations)

at.algebraic-topology cohomology classifying-spaces cobordism

dec 1 at 6:36 Greg Kuperberg 13.8k●1●30●70

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answer

245

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Motivation for the étale topology over other possibilities

ag.algebraic-geometry etale-cohomology

feb 21 at 19:03 Sam Derbyshire 1,084●6●23

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254

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Euler characteristic of a manifold and self-intersection

at.algebraic-topology

oct 16 at 8:01 Bhargav 725●2●6

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435

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Definition and meaning of the conductor of an elliptic curve

elliptic-curves nt.number-theory ag.algebraic-geometry

jan 26 at 22:50 Qing Liu 1,496●4●10

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243

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How are multiplicative sequences related to formal power series and genera of manifolds?

at.algebraic-topology cohomology characteristic-classes

nov 26 at 0:38 Sam Derbyshire 1,084●6●23

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answers

314

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Describing the universal covering map for the twice punctured complex plane

at.algebraic-topology differential-equations

oct 23 at 4:23 Scott Carnahan 6,528●4●28

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Famous mathematical quotes (3)

What’s your favorite equation, formula, identity or inequality?

Cocktail party math

Colloquial catchy statements encoding serious mathematics (2)

Do good math jokes exist?

What is the first interesting theorem in (insert subject here)? (2)

Examples of great mathematical writing

Theorems for nothing (and the proofs for free)

j-invariant of a supersingular elliptic curve

Notions of degree for maps $S^n \to S^n$?

Blackboard rendering of math fonts

reduction of CM elliptic curves

Two questions on isomorphic elliptic curves

How are multiplicative sequences related to formal power series and genera of manifolds?

Non-zero sheaf cohomology

481

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412

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Questions

Famous mathematical quotes

“Philosophical” meaning of the Yoneda Lemma

Explanation for the Chern character

How do you relate the number of independent vector fields on spheres and Bott Periodicity for real K-Theory?

Explanation for the Thom-Pontryagin construction (and its generalisations)

Motivation for the étale topology over other possibilities

Euler characteristic of a manifold and self-intersection

Definition and meaning of the conductor of an elliptic curve

How are multiplicative sequences related to formal power series and genera of manifolds?

Describing the universal covering map for the twice punctured complex plane

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