TY - BOOK AU - Spiegel, Eugene. AU - O'Donnell, Christopher J. TI - Incidence algebras T2 - Pure and applied mathematics SN - 0824700368 U1 - 512.24 PY - 1997/// CY - New York: PB - Marcel Dekker Inc., KW - Algebras KW - Math KW - Mobius function KW - Radicals ER -