Yuji Tachikawa

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Name	Yuji Tachikawa
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There's no string-theory-overflow? Come on...

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Why is a 2d TQFT formulated as a functor?

jun 2 11 at 22:41 Kevin Costello 643●4●7

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How can I visualize the nontrivial element of $\pi_4(S^3)$ and $\pi_5(S^3)$ ?

homotopy-theory soft-question

sep 20 10 at 15:55 Yuji Tachikawa 2,393●1●5●23

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Number of triples of roots (of a simply-laced root system) which sum to zero

root-systems lie-algebras

jul 14 11 at 12:44 Kimyeong Lee 51●3

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938

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Virasoro action on the elliptic cohomology

reference-request at.algebraic-topology rt.representation-theory elliptic-cohomology

feb 16 11 at 18:32 Dmitri Pavlov 6,973●1●13●44

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What does the word “symplectic” mean?

etymology soft-question sg.symplectic-geometry

jun 28 11 at 13:55 Giuseppe 2,379●7●23

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Is there a “motivic Gromov-Witten invariant”?

ag.algebraic-geometry gromov-witten-theory

apr 5 11 at 23:26 Jim Bryan 2,659●1●7●22

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659

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When is a coadjoint orbit an integrable system (in a weak sense explained below)?

sg.symplectic-geometry rt.representation-theory

jan 14 12 at 11:54 Alexander Chervov 7,093●1●16●41

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Why is Drinfeld’s Zastava space called Zastava?

etymology ag.algebraic-geometry rt.representation-theory

jan 9 11 at 18:12 ivan mirkovic 266●2●2

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915

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Du Val singularity of type G=A,D,E and “small” representations of G

ag.algebraic-geometry singularity-theory ade-classifications

oct 21 11 at 6:22 MathOverflow♦ 1●2●3

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970

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Literature on the Springer resolution

ag.algebraic-geometry rt.representation-theory textbook-recommendation algebraic-groups reference-request

sep 13 11 at 12:28 David White 4,848●1●20●27

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What would you want to see at the Museum of Mathematics?

What are good non-English languages for mathematicians to know?

Spinor space to Euc. vector space: does there exist a universal bilinear map?

Conformal Field Theory and Langlands

What is the motivation for a vertex algebra?

Can’t find Segal’s papers in CFT

Witten Index, letter partition function and superconformal representations.

Sheets in Lie algebras are classified by the pair $(\mathfrak{l},O)$. How about sheets in Lie groups?

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Yuji Tachikawa

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Questions

Why is a 2d TQFT formulated as a functor?

How can I visualize the nontrivial element of $\pi_4(S^3)$ and $\pi_5(S^3)$ ?

Number of triples of roots (of a simply-laced root system) which sum to zero

Virasoro action on the elliptic cohomology

What does the word “symplectic” mean?

Is there a “motivic Gromov-Witten invariant”?

When is a coadjoint orbit an integrable system (in a weak sense explained below)?

Why is Drinfeld’s Zastava space called Zastava?

Du Val singularity of type G=A,D,E and “small” representations of G

Literature on the Springer resolution

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