> But what about the inconsistency in the first two examples?
 
> For Infinite Polynomial Rings, I always need conversion *by names*. Is
> there a conversion command (for MPolynomialRing_libsingular, at least)
> that always behaves exactly like "imap" (and is as fast as imap, too)?

It should always  map *by names* and not by index IMHO.
 

-- 
name: Martin Albrecht
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_www: http://www.informatik.uni-bremen.de/~malb
_jab: [email protected]

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