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Maximal Independent Subsets of Linear Spaces

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Whats a linear space? Given a set of points V a set of lines where a line is a k-set of points each pair of points occurs in exactly one line Find the largest set of independent points IP such that IP does not subsume any line (k-set)

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An Example V = {0,1,2,3,4,5,6} L = {{0,1,2},{0,3,6},{0,4,5},{2,3,4},{1,4,6},{2,6,5},{1,3,5}} IP = {0,1,3,4} L is a design there are many designs you are given the design IP is an independent set of points but is it maximal?

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In General? The line can be of size k with property no two lines contain the same pair each pair exists

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A Solution? V = {0,1,2,3,4,5,6} L = {{0,1,2},{0,3,6},{0,5,6},{2,3,4},{1,4,6},{2,6,5},{1,3,5}} IP = {0,1,3,4} using the above as an example have variables X0, X1, X2, X3, X4, X5, X6 Xi = 1 -> i is in the independent set Xi = 0 -> i is not in the independent set have the following constraints (X0 + X1 + X2) < 3 (X0 + X3 + X6) < 3 (X0 + X5 + X6) < 3 (X2 + X3 + X4) < 3 (X1 + X4 + X6) < 3 (X2 + X6 + X5) < 3 (X1 + X3 + X5) < 3 maximise X0 + X1 + X2 + X3 + X4 + X5 + X6 use a constraint programming toolkit

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So? The encoding ignores possibly useful information What variable and value ordering heuristics might we use? Wheres the data Wheres the constraint program (any takers?)? Is it interesting? Is the design more interesting than the independent set?

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Thats all

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Global Constraints Toby Walsh NICTA and University of New South Wales www.cse.unsw.edu.au/~tw.

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