[seqfan] Re: Unique Products Regarding Binary Matrices

[Rob Pratt]

18:

0    0    0    0    0    1    1    1    1
0    0    1    0    0    0    0    0    1
0    0    0    0    0    0    0    1    1
0    1    0    1    0    1    1    1    0
0    1    0    1    0    1    0    1    0
1    1    0    1    0    1    1    1    0
0    0    0    1    1    1    0    1    0
0    0    0    0    1    0    1    0    1
0    0    0    0    1    0    0    1    0

Note that for n = 9, there are exactly 18 possible products (the ones you list below, and 1), so each one must be used.

Rob

-----Original Message-----
From: seqfan-bounces at list.seqfan.eu [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Douglas McNeil
Sent: Friday, June 11, 2010 11:57 AM
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: Unique Products Regarding Binary Matrices

> I too have been able to get 16 unique products. But getting those last 2 products to differ is a *little* tricky, perhaps, if possible.

I can get 17 -- set([2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18,
20, 24, 27]) -- but not 18 yet.


Doug

--
Department of Earth Sciences
University of Hong Kong


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