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Quasipolar Subrings of 3 X 3 Matrix Rings
(Sciendo, 2013)
An element a of a ring R is called quasipolar provided that there exists an idempotent p is an element of R such that p is an element of comm(2)(a), a + p is an element of U(R) and ap is an element of R-qnil. A ring R is ...