Proceedings of the Edinburgh Mathematical Society · 1969 · 37 citations · 3 references
Natural SciencesMathematicsAlgebraGeometryNumber TheoryAbstract AlgebraCommutative AlgebraFinite Division RingsIdeal TheoryIdentity
The following theorems in ring theory are well-known: 1. Let R be a ring. If e is a unique left identity, then e is also a right identity. 2. If R is a ring with more than one element such that aR = R for every nonzero element a ε R , then R is a division ring. 3. A ring R with identity e ≠ 0 is a division ring if and only if it has no proper right ideals.
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On the Commutativity of Addition
Bernhard Neumann · Journal of the London Mathematical Society · 1940 · 66 citations
Near-Rings with Trivial Multiplications
Joseph J. Malone · American Mathematical Monthly · 1967 · 22 citations