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Complex Analysis · Axiom Academy
One function ties the whole numbers to the primes — and a single unproven guess about where it vanishes. Start with the simplest possible recipe. Pick an exponent s , raise every whole number to the power -s , and add the results up. That infinite sum is the Riemann zeta function . converges whenever the real part of s exceeds 1 When the terms shrink fast enough that the total settles on a finite value. A famous case is s=2 , which Euler evaluated exactly: 2. Zeta Secretly Counts the Primes Here is the bridge Riemann built on. That same sum can be rewritten as a product over the prime numbers — one factor for each prime p . This is Euler's product formula . the sum over all integers equals a product over only the primes Why does it work? Expanding each factor as a geometric series and multiplying reproduces 1/n^s for every n exactly once — because every integer factors into primes in exactly one way (the fundamental theorem of arithmetic). The product runs over — nothing else. The primes alone build . A term like 1/6^s appears as — the product manufactures every composite from its prime factors. Because is built entirely from primes, anything we learn about — especially where it equals zero — feeds back into how the primes are distributed. That is the entire reason the next step matters. 3. The Zeros — and the Conjecture Through analytic continuation , extends to (almost) the whole complex plane, where it picks up zeros . They come in two families.
This is the written version of the interactive lesson above. See the full Complex Analysis course.