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Mar 21, 2010 at 15:37 vote accept Franz Lemmermeyer
Mar 20, 2010 at 12:59 comment added Torsten Ekedahl Nice. It essentially covers what I did here.
Mar 20, 2010 at 11:34 comment added Robin Chapman There's a very nice paper Martin Kneser, "Composition of binary quadratic forms" Journal of Number Theory, Volume 15, 406-413 (1982) whch develops the Clifford algebra viewpoint on binary quadratic forms.
Mar 20, 2010 at 8:08 history edited Torsten Ekedahl CC BY-SA 2.5
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Mar 20, 2010 at 7:32 history edited Torsten Ekedahl CC BY-SA 2.5
Added clarifications as to the relevance to the original question
Mar 19, 2010 at 6:30 history edited Torsten Ekedahl CC BY-SA 2.5
Added calculation to show that we get the formula of the question.; added 20 characters in body
Mar 18, 2010 at 21:00 history answered Torsten Ekedahl CC BY-SA 2.5