[seqfan] Re: 23 sequences
wouter.meeussen at telenet.be
Sun Feb 10 13:04:36 CET 2013
the first I looked at : A139039
there is more at hand than just a 'not-tilde' that might be either
equal, not-equal, greater, less, etc.
The entire mathematica formula line is in need of correction.
Working on it ...
From: Charles Greathouse
Sent: Sunday, February 10, 2013 7:18 AM
To: Sequence Fanatics Discussion list
Subject: [seqfan] 23 sequences
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.
Case Western Reserve University
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