How can I show that there are no non-commutative unitary rings of order $n$ with $1 \leq n \leq 7$ and that there exists a non-commutative unitary ring of order 8?
I could use any help, because we did not treat this during the lectures yet
2026-05-16 21:08:51.1778965731
Non-commutative unitary rings
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