[seqfan] 23 sequences

Charles Greathouse charles.greathouse at case.edu
Sun Feb 10 07:18:07 CET 2013

It seems that several sequences
have the notation (nonascii character here). If any contributors have a
moment to spare, look through these sequences and see if you can fix two or

Most of these are cases of formulas with some Greek or other symbol which
has been omitted. Representative example:

The case r = 1 gives standard alternating sign matrices, while the case in
which all matrix entries are nonnegative gives semimagic squares. We show
that the higher spin alternating sign matrices of size n are the integer
points of the r-th dilate of an integral convex polytope of dimension (n
[nonascii character here] 1)^2 whose vertices are the standard alternating
sign matrices of size n. It then follows that, for fixed n, these matrices
are enumerated by an Ehrhart polynomial in r.

Charles Greathouse
Case Western Reserve University

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