TITLE:
The Partial Jacobian Matrix and the Chain Rule for Functions on Products of Real n-Spaces
AUTHORS:
Amod Agashe
KEYWORDS:
Chain Rule, Partial Derivative, Jacobian Matrix, Partial Jacobian Matrix, Normed Vector Spaces, Manifolds
JOURNAL NAME:
Applied Mathematics,
Vol.16 No.4,
April
30,
2025
ABSTRACT: The usual chain rule is for compositions of functions from
R
n
to
R
m
, for some
m
and
n
. We consider functions whose domains and codomains are products of various
R
n
’s, and introduce the notion of a partial Jacobian matrix, using which we formulate a chain rule in this setting that should be useful for calculations as well as for some theoretical purposes.