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Dennis Sullivan

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Answers (16)

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26	Nontrivial finite group with trivial group homologies?
22	Is there a complex structure on the 6-sphere?
16	What is torsion in differential geometry intuitively?
16	Mixed Hodge structure on the rational homotopy type
15	Poincare duality and the $A_\infty$ structure on cohomology

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+10	What is torsion in differential geometry intuitively?
+10	Poincare duality and the $A_\infty$ structure on cohomology
+10	Nontrivial finite group with trivial group homologies?
+10	History of the notion of $(G,X)$-structure

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77 at.algebraic-topology × 7	26 group-cohomology
36 dg.differential-geometry × 5	26 gr.group-theory
31 gt.geometric-topology × 5	21 ag.algebraic-geometry × 2
31 rational-homotopy-theory × 2	16 hodge-theory
26 open-problems × 2	16 torsion

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	MathOverflow	1,632 rep	18 silver badges14 bronze badges
	Mathematics	276 rep	2 silver badges4 bronze badges
	Physics	121 rep	1 bronze badge

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