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The Bordalo order on a commutative ring

Melvin Henriksen, Frank A. Smith (1999)

Commentationes Mathematicae Universitatis Carolinae

If R is a commutative ring with identity and is defined by letting a b mean a b = a or a = b , then ( R , ) is a partially ordered ring. Necessary and sufficient conditions on R are given for ( R , ) to be a lattice, and conditions are given for it to be modular or distributive. The results are applied to the rings Z n of integers mod n for n 2 . In particular, if R is reduced, then ( R , ) is a lattice iff R is a weak Baer ring, and ( R , ) is a distributive lattice iff R is a Boolean ring, Z 3 , Z 4 , Z 2 [ x ] / x 2 Z 2 [ x ] , or a four element field.

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