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Tolerante Catalanzahlen. (German) Zbl 0553.06010

The author makes clear the connection between the number of tolerances in a chain and some other combinatorial concepts.
Reviewer: E.Fried

MSC:

06B10 Lattice ideals, congruence relations
05A15 Exact enumeration problems, generating functions
08A30 Subalgebras, congruence relations
06A05 Total orders
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