Issues with integral

[parisse]

@Mordicus1973: The code executed on the Prime is not always the same as on a PC. One reason is that exceptions are not enabled on the Prime, and this make keyboard interruption harder to handle. Another reason is that some optimizations are not enabled on the Prime for various reasons, e.g. it is not possible to link with the GPL libraries like on a PC.

@pinkman: this is an expert diagnostic message. Xcas handles simplification of sqrt or fractional powers by constructing a unique algebraic extension. Sometimes extracting a square root or fractional power inside an extension requires choosing a branch. For numeric sqrt, this is done by checking approx values. If the sqrt argument depends on a parameter, the system must still choose, and it does that by replacing the parameter with random numeric values. If you make assumptions on the parameter, the assumption is taken in account in the random choice.