Oh, Pythagoras

In Simon Singh's wonderful book on Fermat's Last Theorem, he tells of the death of Pythagoras of Samos:

Following the death of their founder and the attack by Cylon, the Brotherhood left Croton for other cities in Magna Graecia, but the persecution continued and eventually many of them had to settle in foreign lands. This enforced migration encouraged the Pythagoreans to spread their mathematical gospel throughout the ancient world...

It is difficult to murder ideas. Most attempts to do so fail.