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nLab > Latest Changes: Tor

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- CommentRowNumber1.
- CommentAuthorUrs
- CommentTimeOct 8th 2012
- (edited Oct 8th 2012)
- PermaLink
Author: Urs
Format: MarkdownItexadded a basic remark on the _[Relation to torsion groups](http://ncatlab.org/nlab/show/Tor#RelationToTorsionGroups)_ to _[[Tor]]_.

added a basic remark on the Relation to torsion groups to Tor.
- CommentRowNumber2.
- CommentAuthorUrs
- CommentTimeOct 8th 2012
- (edited Oct 8th 2012)
- PermaLink
Author: Urs
Format: MarkdownItexI have been further editing _[[Tor]]_. There is now in _[Symmetry in the two arguments](http://ncatlab.org/nlab/show/Tor#SymmetryInTheTwoArguments)_ an (intentionally) baby version of the proof that $Tor_n^R(A,B) \simeq Tor_n^R(B,A)$, namely for the simple case that $R$ is a principal ideal domain.

I have been further editing Tor. There is now in Symmetry in the two arguments an (intentionally) baby version of the proof that $Tor_n^R(A,B) \simeq Tor_n^R(B,A)$ , namely for the simple case that $R$ is a principal ideal domain.

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