English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We discuss certain aspects of the formal calculus used to describe vertex algebras. In the standard literature on formal calculus, the expression $(x+y)^{n}$, where $n$ is not necessarily a nonnegative integer, is defined as the formal Taylor series given by the binomial series in nonnegative powers of the second-listed variable (namely, $y$). We present a viewpoint that for some purposes of generalization of the formal calculus including and beyond "logarithmic formal calculus", it seems useful, using the formal Taylor theorem as a guide, to instead take as the definition of $(x+y)^{n}$ the formal series which is the result of acting on $x^{n}$ by a formal translation operator, a certain exponentiated derivation. These differing approaches are equivalent, and in the standard generality of formal calculus or logarithmic formal calculus there is no reason to prefer one approach over the other. However, using this second point of view, we may more easily, and in fact do, consider extensions in two directions, sometimes in conjunction. The first extension is to replace $x^{n}$ by more general objects such as the formal variable $\log x$, which appears in the logarithmic formal calculus, and also, more interestingly, by iterated-logarithm expressions. The second extension is to replace the formal translation operator by a more general formal change of variable operator. In addition, we note some of the combinatorics underlying the formal calculus which we treat, and we end by briefly mentioning a connection to Fa\`a di Bruno's classical formula for the higher derivatives of a composite function and the classical umbral calculus. Many of these results are extracted from more extensive papers \cite{R1} and \cite{R2}, to appear.

New perspectives on exponentiated derivations, the formal Taylor theorem, and Faà di Bruno’s formula