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| How opposite function works https://www.singular.uni-kl.de/forum/viewtopic.php?f=10&t=1793 |
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| Author: | jlobillo [ Thu Jan 07, 2010 1:01 pm ] |
| Post subject: | How opposite function works |
Dear friends, I'm writting a library about Hopf algebras such that the underlying algebras structure fits the algebras managed by Singular, commutative and non-commutative ones. Since the antipode map in an antialgebra morphism I have decided to define it over the opposite algebra. The problem is that opposite([ring]) returns the same ring if it is commutative. However oppose() always returns the opposite element. So I think that it would be better than the opposite() function always returns the same construction as in the non-commutative setting, i.e. changing lowercase to uppercase and changing the order of variables. This allows a more compact definition of new code. Best, Javier Lobillo |
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| Author: | levandov [ Wed Feb 03, 2010 2:47 pm ] |
| Post subject: | Re: How opposite function works |
Dear Javier, thank you for the suggestion. Yes, it's a nice idea to return a different ring and make synchronization with the way how "oppose" works. We'll keep it in mind. With best regards, Viktor |
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