Tensor products are not really defined for groups, but rather for modules
over rings. Abelian groups are-modules, and so tensor products are defined for abelian groups, but this is a construction of a very different flavour
to all the other constructions listed on this page.
Perhaps it would be better to have a comment somewhere on the page to this effect
(i.e. that one can define the tensor product of two abelian groups), and then just
link to the How to use tensor products page for more details.
If there are no objections, I will do this some time soon.
Yes, I was thinking about the tensor product for abelian groups as a special case of a product construction (in Ring theory it is quite usual to think of everything as modules). Feel free to change it as you say, I added it just as a suggestion (I put it on the list because there really isn't any more on the stub at the moment!)
There could be a link somewhere among the later examples to Use topology to study your group, although I haven't thought very carefully about where it would sit best.
Comments
Tensor products are not
Sat, 25/04/2009 - 05:55 — emertonTensor products are not really defined for groups, but rather for modules
over rings. Abelian groups are -modules, and so tensor products are defined for abelian groups, but this is a construction of a very different flavour
to all the other constructions listed on this page.
Perhaps it would be better to have a comment somewhere on the page to this effect
(i.e. that one can define the tensor product of two abelian groups), and then just
link to the How to use tensor products page for more details.
If there are no objections, I will do this some time soon.
I agree
Sat, 25/04/2009 - 09:28 — JoseBroxYes, I was thinking about the tensor product for abelian groups as a special case of a product construction (in Ring theory it is quite usual to think of everything as modules). Feel free to change it as you say, I added it just as a suggestion (I put it on the list because there really isn't any more on the stub at the moment!)
There could be a link
Mon, 11/05/2009 - 05:11 — emertonThere could be a link somewhere among the later examples to Use topology to study your group, although I haven't thought very carefully about where it would sit best.