SuppressArguments

 Author: Kurt Pagani 
 Date Created: Tue April 20 04:30:24 CET 2021
 License: BSD
 Keywords:
 Examples:
 References:
 Documentation:

 rewrite(x,f,a,n,s) substitutes in an expression
 "x" all occurences of "f a" and its derivatives up to
 order $n$, where "f" is a basic operator, "a" the list
 of arguments, by the symbol "s" and "s[...]" for the
 derivatives respectively.

 multiIndices(n,m) returns a list of multi indices
 as list of integers I=[i_1,...,i_m], such that
 i_k >= 0, and |I|=i_1 + ... + i_m = n.

 derivativesOfOrder(n,f,a) returns the list of partial derivatives
 of order "n" of "f a" (i.e. f(a_1,...,a_m)) with respect to the
 variables "a_i".

 Substitution list for derivatives of order "n".

 Build subscripted symbol, then coerce to expression.