Author: Dominic Joyce

This book studies generalized Donaldson-Thomas invariants$/bar{DT}{}^/alpha(/tau)$. They are rational numbers which ‘count’ both $/tau$-stable and $/tau$-semistable coherent sheaves with Chern charac …

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If $X$ is a manifold then the $/mathbb R$-algebra $C^/infty (X)$ of smooth functions $c:X/rightarrow /mathbb R$ is a $C^/infty $-ring. That is, for each smooth function $f:/mathbb R^n/rightarrow /mat …

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