Families of zero cycles and divided powers: I. Representability

Details Families of zero cycles and divided powers: I. Representability Families of zero cycles and divided powers: I. Representability

2008-03-05

arxiv.org/abs/0803.0618v1

Mathematics

Algebraic Geometry

52 pages

Scientific paper

For any separated algebraic space $X/S$ we construct a separated algebraic space $\Gamma^d(X/S)$ -- the space of divided powers -- which parameterizes zero cycles of degree $d$ on $X$. The space of divided powers for an affine scheme is given by the spectrum of the algebra of divided powers. In characteristic zero or when $X/S$ is flat, the constructed space coincides with the symmetric product $Sym^d(X/S)$. We also prove several fundamental results on the kernels of multiplicative polynomial laws necessary for the construction of $\Gamma^d(X/S)$.

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