Hi, I wanted to get the sum of two piecewise linear  functions, but the 
obvious thing does not seem to work; is there an easy (= already 
implemented) way to do this?
here is what I mean:

R.<t> = RR[]
a = Piecewise([[0,1],t])
b = Piecewise([[0,1],t])
c = a+b

thanks in advance!

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