Carolus
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 Mar 5 awarded Nice Question Sep 18 awarded Popular Question Jun 13 awarded Yearling Jul 2 awarded Curious Jul 2 awarded Inquisitive Jun 13 awarded Yearling May 2 comment Adjoining elements to a ring. Of course. I was just curious if you were thinking of some other specific branch(es) of math in contrast to abstract algebra. Just a stupid question :) May 2 comment Adjoining elements to a ring. You write "$C$ is a ring isomorphic to $A$ (which means they are practically the same, from the point of view of abstract algebra)", and I was wondering if you could explain from what point of view they're not the same? Apr 29 accepted Proving integrality of a sequence of numbers Apr 29 comment Proving integrality of a sequence of numbers This looks very interesting, but it seems to be quite far beyond my current mathematical abilities. I'm familiar with most of the material in Artin's Algebra and I know some combinatorics. Do you have any suggestion what to study in order to understand this material better? Any thing more specific than more algebra? Apr 28 comment Proving integrality of a sequence of numbers @vonbrand I was reading about Somos sequences and I wanted to see if I could come up with something similar. Basically I just fooled around in Mathematica until I found something that seemed to be integral :) Apr 27 asked Proving integrality of a sequence of numbers Feb 6 awarded Popular Question Jun 13 awarded Yearling May 8 awarded Caucus May 3 awarded Informed Apr 30 comment Morphisms in a category with products What are $p_1$ and $p_2$? Where do these different subscripts come from? Apr 30 comment Morphisms in a category with products Thank you very much! I'm beginning to understand now. The diagrams at ProofWiki were also helpful. Apr 30 comment Morphisms in a category with products On my diagram... Apr 30 comment Morphisms in a category with products Ok, I've verified the "bottom part" of the above diagram symbolically, but my problem is the top part. Can you show me how to do it?