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Ep 194: David Deutsch’s ”The Fabric of Reality” Chapter 9 ”Quantum Computers” Part 4: Shor’s Algorithm

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How to Find the Greatest Common Divisor of Large Numbers

Euclid figured out that rather than starting at 2 and seeing if that divides into our big number And then 3 and then 5, sequentially going through all the prime numbers Up until you eventually find p By a process of just brute force So to speak We're instead going to guess Basically randomly Any old number Okay, because we're going to find the factors of n We'regoing to find p and q We're going to pick any old number Smaller than n Recall that A equals x mod n We want to know if A and n are relatively prime Do they share factors? That's a question Of what their greatest common divisories The greatestcommon divisories is a term used

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