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Tag Archives: Latin square
Association schemes for diagonal groups
Sean Eberhard commented on my posts on diagonal groups (see here and here). He is correct; there is an association scheme preserved by the full diagonal group with n factors in the socle; it is nontrivial if n > 2. The details … Continue reading
Posted in open problems
Tagged association scheme, diagonal group, Latin hypercube, Latin square
1 Comment
Endomorphism monoids of graphs
A monoid is, for me, a set of mappings on a finite domain which is closed under composition and contains the identity mapping. The composition is, of course, associative. Thus, it is “a group without the inverses”. A homomorphism from … Continue reading
Posted in exposition, open problems
Tagged endomorphism monoid, grid graph, Latin square, semigroup
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Bluebells, 2
I didn’t give you enough information in the preceding post to find the grid reference to the bluebell wood. Here is some more, which should be more than enough. This is a part of the substitution table (rows and columns … Continue reading
Posted in exposition
Tagged frequency analysis, Latin square, onetime pad, substitution cipher, Sudoku
1 Comment