Vladimir, On 2005-05-13, you wrote:

Here is the patch which was described in my previous message (Fri May 13 17:27:25 CEST 2005).

Several days ago, Christian found out that the speed of computation of our symbolic determinants seems to have deteriorated recently. Indeed, times like Lewis-Wester O1 have dropped by about 50%. I'm pretty sure this happend with your patch. In particular, the two calls to rename_dummy_indices_uniquely from within mul::expand appear to be quite expensive. By defining GINAC_COMPARE_STATISTICS in basic.h I found that it increases the number of calls to ex::is_equal by about an order of magnitude. Is there a way to speed this up again? Regards -richy. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>