Sam Derbyshire

2,601

Reputation

2311 views

Registered User

Name	Sam Derbyshire
Member for	3 years
Seen	May 20 at 16:30
Website
Location	King's College London, United Kingdom
Age	23

Cohomology enthusiast.

stats recent reputation favorites

Questions

votes newest views recent

votes

answers

39k

views

Famous mathematical quotes [closed]

feb 1 11 at 5:06 J. H. S. 2,425●12●31

votes

answers

views

“Philosophical” meaning of the Yoneda Lemma

ct.category-theory intuition

feb 25 at 13:07 Tom Leinster 13.5k●1●40●83

votes

answers

views

Explanation for the Chern character

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

mar 17 10 at 6:20 Peter Teichner 1,226●14●8

votes

answer

views

Is Li(x) the best possible approximation to the prime-counting function?

nt.number-theory analytic-number-theory prime-numbers

jul 4 10 at 18:36 Will Jagy 12.5k●1●26●45

votes

answers

views

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

at.algebraic-topology cohomology classifying-spaces cobordism wcatss

jul 21 10 at 18:12 Daniel Moskovich 11.1k●1●36●106

votes

answers

views

Definition and meaning of the conductor of an elliptic curve

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

jul 14 at 3:00 REINZELLE MARTIN 1

votes

answers

views

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 28 10 at 2:02 Sam Derbyshire 2,601●3●21●44

votes

answer

views

Cohomology of sheaves in different Grothendieck topologies

sheaf-theory etale-cohomology descent topos-theory ag.algebraic-geometry

sep 26 at 11:01 Thomas Geisser 471●4●5

votes

answer

795

views

Why does the naive definition of compactly supported étale cohomology give the wrong answer?

ag.algebraic-geometry etale-cohomology derived-category derived-functors

apr 12 10 at 1:28 JS Milne 5,518●18●36

votes

answer

views

Are all Galois cohomology groups also étale cohomology groups?

ag.algebraic-geometry cohomology etale-cohomology galois-cohomology group-cohomology

jun 19 10 at 13:39 Sam Derbyshire 2,601●3●21●44

Answers

votes newest views recent

Famous mathematical quotes (3)

Colloquial catchy statements encoding serious mathematics (2)

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

Cocktail party math

Do good math jokes exist?

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

Examples of great mathematical writing

Thinking and Explaining

Blackboard rendering of math fonts

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

Theorems for nothing (and the proofs for free)

Are the ‘semi’ trivial zeros of $\zeta(s) \pm \zeta(1-s)$ all on the critical line?

j-invariant of a supersingular elliptic curve

reduction of CM elliptic curves

Difference between orthogonal form and seminormal form

Two questions on isomorphic elliptic curves

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

-1

Non-zero sheaf cohomology

1646

Votes

1485

161

Badges

user feed

Sam Derbyshire

Account Recovery

Registered User

Questions

Famous mathematical quotes [closed]

“Philosophical” meaning of the Yoneda Lemma

Explanation for the Chern character

Is Li(x) the best possible approximation to the prime-counting function?

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

Definition and meaning of the conductor of an elliptic curve

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

Cohomology of sheaves in different Grothendieck topologies

Why does the naive definition of compactly supported étale cohomology give the wrong answer?

Are all Galois cohomology groups also étale cohomology groups?

Answers

Votes

Tags

Badges