history of mathematics

2 articles · All tags

• Prime Numbers and the Sieve of Eratosthenes
  A prime has exactly two divisors, 1 and itself. Learn why primes never run out, how the ancient Sieve of Eratosthenes finds them, and why they secure the internet.
• The Abacus and Mental Calculation
  How the abacus works, why bead arithmetic outperforms electronic calculators for trained users on speed, and what it reveals about the human number sense.