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2 votes

Combinatorial interpretation of the power of a series

Nice question! You are looking for a combinatorial interpretation of nth-fold self-convolution of a sequence. A quick google serach gave me this result on Catalan sequence. In this paper, a similar re …
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4 votes

Collection of conjectures and open problems in graph theory

A list of about 60 algorithmic problems pertaining to trees are given in the paper by Stephen T. Hedetniemi (Wayback Machine, journal website). Some of the discussion in the paper can be extended to q …
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