Changes http://wiki.axiom-developer.org/211ProductsAreDifferentiatedIncorrectly/diff -- \begin{axiom} )version D(product((1-q^(n-i))/(1-q^(m-i)),i=0..m-1),q) f:=operator 'f; D(product(f(i,q),i=0..m),q) \end{axiom}
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