Euclid division lemma biography channel

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    Euclid's lemma

    A prime divisor of a product divides one of the factors

    Not to be confused with Euclid's division lemma, Euclid's theorem, or Euclidean algorithm.

    In algebra and number theory, Euclid's lemma is a lemma that captures a fundamental property of prime numbers:[note 1]

    Euclid's lemma — If a prime p divides the product ab of two integers a and b, then p must divide at least one of those integers a or b.

    For example, if p = 19, a = 133, b = 143, then ab = 133 × 143 = 19019, and since this is divisible by 19, the lemma implies that one or both of 133 or 143 must be as well.

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  • In fact, 133 = 19 × 7.

    The lemma first appeared in Euclid's Elements, and is a fundamental result in elementary number theory.

    If the premise of the lemma does not hold, that is, if p is a composite number, its consequent may be either true or false.

    For example, in the case of p = 10, a = 4, b = 15, composite number 10 divid