Viktor Toth - 2011-07-17

Another (related?) problem is that this shouldn't happen:

(%i7) ishow((o([i],[])*s([j],[]))~o([k],[]))$
(%t7) 0
(%i8) ishow((o([j],[])*s([i],[]))~o([k],[]))$
o (o s - s o )
j i k i k
(%t8) - ------------------
2