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Answers for “为什么最后一个非零余数 $r_n$ 是 $\gcd(a,b)$?”

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The Euclidean algorithm computes the greatest common divisor by repeatedly applying the division algorithm. Starting with two natural numbers aa and bb, you divide the larger by the smaller to get a quotient and a remainder.

Conditions: The inputs aa and bb are natural numbers.; The division algorithm is applied repeatedly.; The process stops when a remainder equals 0.

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In the displayed Euclidean algorithm, aa and bb are the two initial natural numbers whose gcd is being found. qiq_i represents the quotient at the ii-th division step.

Conditions: The symbols are from the general statement of the Euclidean algorithm on the left board.

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The Euclidean algorithm is a method for finding the greatest common divisor (gcd) of two natural numbers. It is set up by repeatedly applying the division algorithm.

Conditions: The inputs aa and bb are natural numbers.; The division algorithm is used at each step.