/sci/ - Science & Math

Anonymous Tue Apr 18 22:09:08 2017 No.8838265 [View]
File: 54 KB, 800x600, Ccjeb41.jpg [View same] [iqdb] [saucenao] [google]

I need to prove: for n >= 4, Z mod n has a nontrivial subring with unity different than 1. How do I do this?

Also, peculiar finding. So I actually made a program that calculates such subrings, and it says Z mod 8 only has the trivial subgroup and itself. I tried to find a subring by hand and I could not.

>>	Anonymous Tue Apr 11 12:39:49 2017 No.8819664 [View] File: 54 KB, 800x600, Ccjeb41.jpg [View same] [iqdb] [saucenao] [google] Is every nontrivial ({0}) subring of an integral domain also an integral domain?

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/sci/ - Science & Math

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