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arXiv 0912.2227math.ATmath.AG
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有理函数的代数同伦类

Algebraic homotopy classes of rational functions

Christophe Cazanave

摘要:

我们计算域的谱上的射影线P^1的自同态的朴素指向同伦类的集合。我们的计算与Fabien Morel的一个自同态的motivic指向同伦类P^1的比较好:在朴素同伦类的集合上存在一个先验幺半群结构,使得从这个幺半群到motivic同伦类群的典范映射是一个群完备。

英文摘要:

We compute the set of naive pointed homotopy classes of endomorphisms of the projective line P^1 over the spectrum of a field. Our computation compares well with Fabien Morel's one of the motivic pointed homotopy classes of endomorphisms of P^1: there is an a priori monoid structure on the set of naive homotopy classes such that canonical map from this monoid to group of motivic homotopy classes is a group completion.

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