What did Hipparchus calculate about possible logical statements in Stoic logic?

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Engraving of six astronomers, with Hipparchus seated at center and, from left to right, Galileo, Johannes Hevelius, Tycho Brahe, Nicolaus Copernicus, and Ptolemy standing, each holding scientific instruments. — Hipparchus “Six astronomers,” the frontispiece of *Astronomica Institutio* (1692) by Jan Luyts, engraving after drawing by Gerard Hoet. Hipparchus is seated at center with from left to right: Galileo, Johannes Hevelius, Tycho Brahe, Nicolaus Copernicus, and Ptolemy.

Hipparchus calculated that there are 103,049 possible logical statements that can be constructed from 10 basic assertions, following the rules of Stoic logic. This calculation is a rare surviving example of Greek interest in combinatoric mathematics.1