On 10/12/07, Richard Fateman <fateman at cs.berkeley.edu> wrote:
> Ratdiff is a function that is intended for use only on polynomials or ratios
> of polynomials in simple independent symbolic variables. It does not use
> any knowledge of exponential, trigonometric, or other functions. It only
> knows about +, *, -, / and integer powers.
Perhaps it should check that the kernels don't depend on the variable.
For cases where ratdiff actually gives a meaningful speedup, this
will not affect the runtime noticeably.
-s