Carolus
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 Jul2 awarded Curious Jul2 awarded Inquisitive Jun13 awarded Yearling May2 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 :) May2 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? Apr29 accepted Proving integrality of a sequence of numbers Apr29 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? Apr28 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 :) Apr27 asked Proving integrality of a sequence of numbers Feb6 awarded Popular Question Jun13 awarded Yearling May8 awarded Caucus May3 awarded Informed Apr30 comment Morphisms in a category with products What are $p_1$ and $p_2$? Where do these different subscripts come from? Apr30 comment Morphisms in a category with products Thank you very much! I'm beginning to understand now. The diagrams at ProofWiki were also helpful. Apr30 comment Morphisms in a category with products On my diagram... Apr30 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? Apr30 comment Morphisms in a category with products @Oskar: I can't say I do with conviction... Apr30 comment Morphisms in a category with products Ok, so it's enough to produce a "valid" diagram? Does my added diagram suffice as proof? (I'm very new to category theory and I'm kind of lost) Apr30 revised Morphisms in a category with products added diagram