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>> No.8838265 [View]
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8838265

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.

>> No.8819664 [View]
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8819664

Is every nontrivial ({0}) subring of an integral domain also an integral domain?

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