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Incidence algebra
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==Literature== Incidence algebras of locally finite posets were treated in a number of papers of [[Gian-Carlo Rota]] beginning in 1964, and by many later [[combinatorics|combinatorialists]]. Rota's 1964 paper was: *{{Citation|last=Rota|first=Gian-Carlo|title=On the Foundations of Combinatorial Theory I: Theory of Möbius Functions|volume=2|issue=4|pages=340–368|year=1964|journal=Zeitschrift für Wahrscheinlichkeitstheorie und Verwandte Gebiete|doi=10.1007/BF00531932|s2cid=121334025|doi-access=free}} * [[Nathan Jacobson|N. Jacobson]], ''Basic Algebra''. I, W. H. Freeman and Co., 1974. ''See section 8.6 for a treatment of Mobius functions on posets'' {{Reflist}}
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