# Jacobi-Zariski exact sequence for Hochschild homology and cyclic (co)homology

## Atabey Kaygun

We prove that for an inclusion of unital associative but not necessarily commutative $\Bbbk$-algebras $\mathcal{B}\subseteq \mathcal{A}$ we have long exact sequences in Hochschild homology and cyclic (co)homology akin to the Jacobi-Zariski sequence in André-Quillen homology, provided that the quotient $\mathcal{B}$-module $\mathcal{A}/\mathcal{B}$ is flat. We also prove that for an arbitrary r-flat morphism $\varphi\colon\mathcal{B}\to\mathcal{A}$ with an H-unital kernel, one can express the Wodzicki excision sequence and our Jacobi-Zariski sequence in Hochschild homology and cyclic (co)homology as a single long exact sequence.

Homology, Homotopy and Applications, Vol. 14 (2012), No. 1, pp.65-78.

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