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Mathematics 21 Online
OpenStudy (anonymous):

Let S be a set of size v and let T be a set of 3-element subsets of S. Furthermore, suppose that (a) each pair of distinct elements of S belongs to at least one triple in T, and (b) |T|<_ (less than or equal to) v(v-1)/6 Show that (S, T) is a Steiner triple system.

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