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The Maxima on-line user's manual

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Ratnumer

Function: ratnumer (<expr>) Returns the numerator of <expr>, after coercing <expr> to a canonical rational expression (CRE). The return value is a CRE.

<expr> is coerced to a CRE by rat if it is not already a CRE. This conversion may change the form of <expr> by putting all terms over a common denominator.

num is similar, but returns an ordinary expression instead of a CRE. Also, num does not attempt to place all terms over a common denominator, and thus some expressions which are considered ratios by ratnumer are not considered ratios by num.

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