From: Rainer Schöpf <rainer.schoepf@gm...>  20121023 16:36:27

Try this: on modular; setmod 2; % This causes nil to be called as function sqrt(1x^2); The crash happens when sqfrf tries a square free factorization of x^21, by differentiating it and computing the gcd. But with setmod 2, the derivative 2*x is simplified to 0. It is not so difficult to avoid the crash, but I'm not sure how the case should be handled. Some more fun: on modular; setmod 11; int(sqrt(1x^2),x,0,1); Rainer 