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 …

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 lo …

I want to find out perfect squares ending in 576, after the number 576. Here is my derivation to arrive at such a number. Let the perfect square ending in 576 be 1000k+576. Every …

Hello, Here are three sets of numbers (A, B). 1) 02091882001, 01744614 2) 01891431001, 01605864 3) 00241133001, 00041947 I am trying to find something common, or perhaps a pat …

(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 …

for an arbitrary word, how can we derive "i" given the pattern below? for a (i = 1) a for ab (i = 3) a ab b for abc (i = 6) a ab abc b bc c for ab …

This was off-topic, sorry...