Mathematica Asked on June 1, 2021
I want to use the NCAlgebra package to do some simplification on non commutative expressions involving integrals. For example, one such expression would be
$$ I=left(int f(x)g(x) dxright) * h $$
where $*$ denotes non-commutative multiplication. Let’s say that I know that $g(x)*h=1$ for all $x$. Then, simplifying the above expression yields
$$ I=int f(x)dx $$
So far, I have tried the following to implement this in Mathematica:
<< NC`
<< NCAlgebra`
NCReplaceRepeated[(A b[X] F[X]) ** (G h J), b[X_] ** h -> 1]
which results in
A G J F[X]
as expected. However, this does not work for
NCReplaceRepeated[(Integrate[A b[X] F[X], X]) ** (G h J), b[X_] ** h -> 1]
which results in
A G J (Integrate[b[X] F[X], X]) ** h
which does not respect this simplification.
Of course, there need to be several assumptions about the integral regarding e.g. convergence. But I want to assume that "everything works out nicely" and that this type of simplification is OK. Additionally, instead of Integrate
, Sum
might be used. This simplification does not work either.
How can I properly perform this simplification?
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