The Sieve, The Sphere, and The Shadow

Eratosthenes—“Beta,” second-best—ran Alexandria’s library. None of his works survive, yet his methods do.

The Sieve: don’t search for primes—delete what isn’t. What remains is irreducible truth.

The Sphere: a stick, a well, a 7.2° shadow → Earth’s circumference within ~2%.

One logic: subtract the false, reveal the real.

More: miketatemath.org