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3 Congruence

Reasoning: Computers, Number Theory and Cryptography3 CongruenceCongruences are an important and useful tool for the study of divisibility. As we shall see,they are also critical in the art of a and b are integers andn>0,wewritea bmodnto meannj(b a). We read this as a is congruent to b modulo (or mod) example, 29 8 mod 7, and 60 0 mod notation is used because the properties of Congruence \ " are very similar to theproperties of equality \=". The next few result make this any integers a and b, and positive integer n, we Ifa bmodnthenb Ifa bmodnandb cmodnthena cmodnThese results are classically called: 1.

Theorem 3.4 If a b mod n then a and b leave the same remainder when divided by n. Conversely if a and b leave the same remainder when divided by n, then a b mod n. Proof: Suppose a b mod n. Then by Theorem 3.3, b = a+nq.Ifa leaves the remainder r when divided by n,wehavea = nQ + r with 0 r<n. Therefore, b = a + nq =

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  Theorem, Remainder

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