English

Note on expanding implicit functions into formal power series by means of multivariable Stirling polynomials

Combinatorics 2026-04-10 v3

Abstract

Starting from the representation of a function f(x,y)f(x,y) as a formal power series with Taylor coefficients fm,nf_{m,n}, we establish a formal series for the implicit function y=y(x)y=y(x) such that f(x,y)=0f(x,y)=0 and the coefficients of the series for yy depend exclusively on the fm,nf_{m,n}. The solution to this problem provided here relies on using partial Bell polynomials and their orthogonal companions.

Keywords

Cite

@article{arxiv.2307.02638,
  title  = {Note on expanding implicit functions into formal power series by means of multivariable Stirling polynomials},
  author = {Alfred Schreiber},
  journal= {arXiv preprint arXiv:2307.02638},
  year   = {2026}
}

Comments

Section 4 has been revised; the statement and proof of the theorem (now Proposition 2) have been corrected