There once lived a man named Marie Jean Antoine Nicolas de Caritat, Marquis of Condorcet (1743–1794). A mathematician and philosopher, his work was mainly focused on advancing social progress towards a more egalitarian society. For instance, he strongly advocated for gender equality as early as in 1787, when he wrote:

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Are there infinitely many primes p such that p + 2 is prime?

The twin prime conjecture states that:

There are infinitely many twin primes

A twin prime is a prime that differs from another prime by two. A set of two primes that differ by two are called a twin prime pair. The first twin prime pairs are:

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