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Thank you

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For simplicity in a long calculation I substituted sum(w[k],k=1..n) by the expression Sw using algsubs. At the end of the calculation I want to replace back Sw by the original expression. Thanks

Dear all:

I wisth to replace in an expression that contains several sums:

sum(a[i],i=1..n+1) and sum(w[i],i=1..n+1)

and replace them with a single command into:

a[n+1]+sum([i],i=1..n) and w[n+1]+sum(w[n],1..n)

everywhere in the expression

Thank you

Claudio