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I think mapping limit over an mbag is sensible and consistent

with much of Maxima.

0 = 0 could reasonally simplify to true, but it could

just as well represent the set of all real (or complex) numbers.

[ If 0 = 0, then 0 x = 0; the solution set of 0 x = 0 is

everything.] I think Maxima shouldn't simplify 0 = 0 to

true or anything else.

Barton