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Results tagged with combinatorics
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user 16223
Questions on the use of Mathematica in combinatorics, including the Combinatorica add-on package.
1
vote
How can I construct an equivalence relation in the form of a 0-1 matrix from a set partition?
The code
parts = {{4, 7, 6}, {5}, {8, 1}, {9, 2, 3}}
perm = PermutationMatrix @ Flatten @ parts;
mat = Transpose[perm] . BlockDiagonalMatrix[
(Table[1, {Length[#1]}, {Length[#1]}] & ) /@ par …
