10

Questions
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Combinatorial proof for the number of lattice paths that return to the axis only at times that are a multiple of 4

feb 2 12 at 5:05 Mike Spivey 1,921●6●16

 
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253
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Maximum vertical distance for a lattice path when NSEW steps are allowed

jan 7 12 at 7:00 Niels Diepeveen 136●3

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When does symmetry in an optimization problem imply that all variables are equal at optimality?

dec 29 11 at 16:50 Mike Spivey 1,921●6●16

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Partitioning the integers $1$ through $n$ so that the product of the elements in one set is equal to the sum of the elements in the other

feb 23 11 at 22:54 Gerhard Paseman 464●3●3

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Can this nested sum be expressed in terms of generalized harmonic numbers and the cycle index polynomials of the symmetric groups?

nov 21 11 at 11:21 pbs 1

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When does a triangle of numbers have a zero row sum?

jan 3 12 at 21:34 Mike Spivey 1,921●6●16

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Asymptotic difference between a function and its “binomial average”

feb 21 11 at 6:15 Mike Spivey 1,921●6●16

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1k
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Laplace’s summation formula

nov 20 10 at 16:06 Tyler Clark 111●9

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499
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How does a tournament’s structure affect the likelihood that the best player will win?

nov 23 10 at 6:34 Mike Spivey 1,921●6●16

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Solving a general two-term combinatorial recurrence relation

nov 25 11 at 16:58 Piotr Migdal 627●3●11