[seqfan] Re: Maximal number of touching points between unit spheres
Richard J. Mathar
mathar at mpia-hd.mpg.de
Wed Mar 14 10:00:54 CET 2018
In answer to http://list.seqfan.eu/pipermail/seqfan/2018-March/018447.html
> The five points representing the vertices of a pair of tetrahedrons joined
> at one face:
> The distances AB, BC, CA, DA, DB, DC, EA, EB, EC are all 1.
The main problem here is that the tetrahedra are a subset of
points on the h.c.p. lattice (stacking ABABAB...), not the f.c.c.
lattice which I and A214813 are searching for.
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