Refinements for infinite direct decompositions of algebraic systems
Peter Crawley, Bjàrni Jónsson · Pacific Journal of Mathematics · 1964
Soc 69 (1963), 541-547. 1 For a fairly complete list of references see Baer [1, 2] or Specht [8], p. 449.797 either a + beB or b + aeB, then aeB.By a central subalgebra of A we mean a subalgebra C of A -800