-- Option variable: ratfac Default value:
true, canonical rational expressions (CRE) are manipulated in a partially factored form.
During rational operations the expression is maintained as fully factored as possible without calling
factor. This should always save space and may save time in some computations. The numerator and denominator are made relatively prime, for example
rat ((x^2 - 1)^4/(x + 1)^2) yields
(x - 1)^4 (x + 1)^2), but the factors within each part may not be relatively prime.
ctensr (Component Tensor Manipulation) package, Ricci, Einstein, Riemann, and Weyl tensors and the scalar curvature are factored automatically when
ratfac should only be set for cases where the tensorial components are known to consist of few terms.
ratweight schemes are incompatible and may not both be used at the same time.
(%o1) true (%i2)