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The Maxima on-line user's manual

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Psexpand

-- Option variable: psexpand Default value: false

When psexpand is true, an extended rational function expression is displayed fully expanded. The switch ratexpand has the same effect.

cauchysum:false;
psexpand:false;
simpproduct:true;
sumexpand:false;
gensumnum:1;
collectterms(sumcontract(intosum(sum(sum(1/((2*k)^s), k, 1, inf) + sum(1/((2*k+1)^s), k, 0, inf), s, 2,2)))), simpsum;

When psexpand is false, a multivariate expression is displayed just as in the rational function package.

When psexpand is multi, then terms with the same total degree in the variables are grouped together.

(%o1)                                true
(%i2) 

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