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单词 DivisibilityByPrimeNumber
释义

divisibility by prime number


Theorem.

Let a and b be integers and p any prime numberMathworldPlanetmath.  Then we have:

pabpapb(1)

Proof. Suppose that  pab.  Then either  pa  or  pa.  In the latter case we have  gcd(a,p)=1,  and therefore the corollary of Bézout’s lemma gives the result  pb.  Conversely, if  pa  or  pb,  then for example  a=mp  for some integer m; this implies that  ab=mbp,  i.e.  pab.

Remark 1. The theorem means, that if a product is divisible by a prime number, then at least one of the factor is divisibe by the prime number. Also conversely.

Remark 2. The condition (1) is expressed in of principal idealsMathworldPlanetmathPlanetmathPlanetmath as

(ab)(p)(a)(p)(b)(p).(2)

Here, (p) is a prime idealMathworldPlanetmathPlanetmath of .

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