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Relative blocking in posets
 J. Comb. Optim
"... Abstract. Posettheoretic generalizations of settheoretic committee constructions are presented. The structure of the corresponding subposets is described. Sequences of irreducible fractions associated to the principal order ideals of finite bounded posets are considered and those related to the Bo ..."
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Abstract. Posettheoretic generalizations of settheoretic committee constructions are presented. The structure of the corresponding subposets is described. Sequences of irreducible fractions associated to the principal order ideals of finite bounded posets are considered and those related to the Boolean lattices are explored; it is shown that such sequences inherit all the familiar properties of the Farey sequences. 1. Introduction and