scientific article; zbMATH DE number 3395910
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zbMath0251.05005MaRDI QIDQ5663875
Publication date: 1969
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Factorials, binomial coefficients, combinatorial functions (05A10) Combinatorial identities, bijective combinatorics (05A19) Groupoids (i.e. small categories in which all morphisms are isomorphisms) (20L05)
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