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James Cranch

Sheffield, UK

http://www.srcf.ucam.org/~jdc41

Teaching fellow at the University of Sheffield. Likes homotopy theory and higher categories.

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Top Questions

If a manifold suspends to a sphere…

gt.geometric-topology asked May 5 '11 at 17:58

mathoverflow.net

Saying things rapidly about integer factorisations

nt.number-theory computational-number-theo prime-numbers factorization asked Aug 5 '12 at 19:35

mathoverflow.net

References for the “nerve of an algebraic variety”

ag.algebraic-geometry at.algebraic-topology simplicial-stuff algebraic-varieties asked May 14 '14 at 11:52

mathoverflow.net

Top Answers

Simplest examples of rings that are not isomorphic to their opposites

mathoverflow.net

A combinatorial question about orthonormal bases

mathoverflow.net

A stronger version of Fermat's last theorem

mathoverflow.net

Can a tangle of arcs interlock in plane?

mathoverflow.net

Metric properties for $d:X\times X\times…X\rightarrow\mathbb R$

mathoverflow.net

Examples of interesting false proofs

mathoverflow.net

Icon Arrangement on Desktop

mathoverflow.net

Techniques for computing cup products in singular cohomology

mathoverflow.net

Isometries between metric spaces

mathoverflow.net

Can a polynomial be almost always divisible by a member of a finite set of primes?

mathoverflow.net

coends of stable infinity categories

mathoverflow.net

A bound on the top homology of a complement to a variety in $\mathbb C^n$

mathoverflow.net

Natural bijection between sets with coloured elements?

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Is every positive integer a sum of at most 4 distinct quarter-squares?

mathoverflow.net

The category of hypergraphs as a topos

mathoverflow.net

Terminology generalizing “quasi-isomorphism”

mathoverflow.net