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math.PR2011★ 1 cited
Coupons collecting with or without replacement, and with multipurpose coupons
Marcel Wild, Svante Janson, Stephan Wagner +1
The classic Coupon-Collector Problem (CCP) is generalized to the extent that each coupons serves certain "purposes". Only basic probability theory is used. Centerpiece rather is an…
math.CO2011
Labeled trees, maps, and an algebraic identity
Stephan Wagner
We give a short and direct proof of a remarkable identity that arises in the enumeration of labeled trees with respect to their indegree sequence, where all edges are oriented from…