00572nam a2200181 a 450000500170000008200190001710000140003624500740005026000360012430000230016049000420018369000210022569000220024696400250026899700180029399900150031195200640032620251203090503.0  a510.8,bD, dur  aDur, Arne  aMobius functions, incidence algebras and power series representations  aNew YorkbSpringer-Verlagc1986  aviii, 133p6c22 cm.  aLecture notes in mathematicsdv. 1202  aMobius functions  aIncidence Algebra  bEngc100de010fg_  a27766 LIBSC C  c9323d9323  00104070aPUbPUd1998-04-08l0o510.8, D, durp27766yBK