[seqfan] Re: A070543 (counting k-dimensional isotropic subspaces)

Neil Sloane njasloane at gmail.com
Wed Aug 21 18:28:48 CEST 2019

This is all classical geometry, and everything is known. I did not check
that particular formula, but it looks right. It is a theorem not a
conjecture. There are many references in my book on coding theory with
MacWilliams.  I corrected the offset and added a Maple program.
Best regards

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com

On Wed, Aug 21, 2019 at 9:21 AM Peter Munn <techsubs at pearceneptune.co.uk>

> Hello seqfans,
> I've been working on a contribution to A141419, and in doing this have
> spotted a link to A070543. So I am preparing a formula to express this
> link derived from the one for T(n, k) in A070543.
> This led me to notice that either the A070543 formula is wrong or
> A070543's offset is, and from the Baez link it is the offset.
> In reading Baez's page, I notice he says, effectively in respect of
> A070543, "I leave it as an easy puzzle to figure out the pattern, and a
> harder puzzle to prove it's true." Not being well-versed in this field,
> I'm not sure what he means by "harder" and am left wondering whether the
> formula (which I am using to derive my new formula) is conjecture or
> truth.
> Can anyone enlighten?
> Best Regards,
> Peter
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