I did see that. Very very cool indeed. I'll have to think about incorporating support for it in the next version of Underground. I can see some interesting things that could be done with with multiplication operator. For a start, it opens the way for Taylor series expansions to provide polynomial approximations of more interesting functions, such as trig functions. When I get a spare couple of days, I'll have to play around with it and see if that sort of thing is really possible.

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