Directional derivatives and higher order chain rules for abelian functor calculus

TL;DR

This paper develops a higher order directional derivative and chain rule within abelian functor calculus, framing it as a cartesian differential category and linking it to classical calculus analogies.

Contribution

It introduces a higher order directional derivative for abelian functors, establishing a Faà di Bruno style formula and a chain rule, expanding the theoretical framework of abelian functor calculus.

Findings

Established a cartesian differential category structure for abelian functor calculus.

Derived a higher order chain rule for functors of abelian categories.

Provided explicit chain homotopy equivalences for properties of abelian functor calculus.

Abstract

In this paper, we consider abelian functor calculus, the calculus of functors of abelian categories established by the second author and McCarthy. We carefully construct a category of abelian categories and suitably homotopically defined functors, and show that this category, equipped with the directional derivative, is a cartesian differential category in the sense of Blute, Cockett, and Seely. This provides an abstract framework that makes certain analogies between classical and functor calculus explicit. Inspired by Huang, Marcantognini, and Young's chain rule for higher order directional derivatives of functions, we define a higher order directional derivative for functors of abelian categories. We show that our higher order directional derivative is related to the iterated partial directional derivatives of the second author and McCarthy by a Fa\`a di Bruno style formula. We obtain a higher order chain rule for our directional derivatives using a feature of the cartesian differential category structure, and with this provide a formulation for the $n$th layers of the Taylor tower of a composition of functors $F\circ G$ in terms of the derivatives and directional derivatives of $F$ and $G$, reminiscent of similar formulations for functors of spaces or spectra by Arone and Ching. Throughout, we provide explicit chain homotopy equivalences that tighten previously established quasi-isomorphisms for properties of abelian functor calculus.