Hamza A. S. Abujabal, "A commutativity theorem for left -unital rings ", International Journal of Mathematics and Mathematical Sciences, vol. 13, Article ID 392717, 6 pages, 1990. https://doi.org/10.1155/S0161171290001065
A commutativity theorem for left -unital rings
In this paper we generalize some well-known commutativity theorems for associative rings as follows: Let be a left -unital ring. If there exist nonnegative integers , , and such that for any , in , , then is commutative.
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