Correspondence homomorphism conjecture for Suslin homology

Let k\Bbbk be an algebraically closed field of characteristic 00, and let X,YSch/kX,Y\in \mathbf{Sch}/\Bbbk. For αcequi(X×kY/X,0)\alpha\in c_{\mathrm{equi}}(X\times_{\Bbbk}Y/X,0), write trα:HiS(X,Z)HiS(Y,Z)\mathrm{tr}_{\alpha}:H_i^S(X,\mathbb{Z})\rightarrow H_i^S(Y,\mathbb{Z}) for the induced homomorphism. Here (M1) and (M2) are the properties defined earlier in the paper.

Correspondence homomorphism conjecture. (i) For any αcequi(X×Y/X,0)\alpha\in c_{\mathrm{equi}}(X\times Y/X,0), trα\mathrm{tr}_{\alpha} satisfies (M1). (ii) For any αcequi(X×X/X,0)\alpha\in c_{\mathrm{equi}}(X\times X/X,0), trα\mathrm{tr}_{\alpha} satisfies (M2).

The conjecture generalizes the corresponding theorem from homomorphisms induced by morphisms to those induced by arbitrary correspondences. It has been confirmed by Bruno Kahn in the appendix.

Sources & referencesView supporting material

Primary source

Xiaowen Hu and with an Appendix by Bruno Kahn, “On Suslin homology with integral coefficients in characteristic zero (with an appendix by Bruno Kahn)”, arXiv:1902.00932 (2020).

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