Call polynomial ring variables by index
In my study I have to work with something like BooleanPolynomialRing(... 'x', 10).
After that I can create function in the form x1 + x1*x3 + ....
However I would like to create functions in more generic form like
x[1] + x[2]*x[3] where x[1] is equivalent for x1, etc.
The final goal is to be able to construct functions programmatically
combining indexed expressions like x[i] + x[j] etc.
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