Andreas J. Guelzow

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We will present a counter example to the conjecture that the class of boolean SQS-skeins is defined by the equation q(x, u, q(y, u, z)) = q(q(x, u, y), u, z). The SQS-skeins satisfying this equation will be seen to be exactly those SQS-skeins that correspond to Steiner quadruple systems whose derived Steiner triple systems are all projective geometries.
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