00385nam a2200109Ia 4500008004100000082001700041100001900058245010200077260003600179300002200215490003800237250701b        |||||||| |||| 00| 0 eng d  a512bP495.CA  aPetrich, Mario  aCategories of algebraic systems, vectors and projective spaces, semigroups, rings and latticesb/  aBerlin:bSpringer-Verlag,c1976  aviii, 217p. Index  aLecture notes in Mathematicsv553