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seen May 2 at 14:33

Jul
2
awarded  Curious
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13
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May
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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
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awarded  Popular Question
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awarded  Yearling
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8
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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?
Apr
30
comment Morphisms in a category with products
@Oskar: I can't say I do with conviction...
Apr
30
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)
Apr
30
revised Morphisms in a category with products
added diagram