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### Shortest absolute value of path in graph

Suppose we have a weighted, acyclic digraph, with positive and negative edge weights.
Is there an algorithm that determines whether there is a path of weight zero between vertices A and B? The ...

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### Finding local patterns in a circular list

Consider a list $\boldsymbol{x}=x_0,x_1,\ldots,x_{n-1}$, which we consider to be circular by taking the subscripts modulo $n$. The entries in the list are distinct integers.
A local pattern is a ...

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### Stricter permutation patterns

(I asked this ten days ago on math.SE, but I received no reply, so I'm trying again here.)
A lot of work has been done on patterns in permutations, where a permutation is said to match a given ...