Bergman, G. M. Boolean rings of projection maps. (English) Zbl 0205.03805 J. Lond. Math. Soc., II. Ser. 4, 593-598 (1972). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 22 Documents MSC: 20K99 Abelian groups 06E20 Ring-theoretic properties of Boolean algebras × Cite Format Result Cite Review PDF Full Text: DOI