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There is not a single law. Integers form a Group and this means that they form a set of elements (numbers) with a binary operation (addition) which satisfies the following four properties for any three integers, x y and z:

  • x and y belong to Z => x + y belongs to Z (closure),
  • (x + y) + z = x + (y + z) {associativity)
  • there is an element, o, in Z, such that x + o = x = o + x (identity). o is represented by the number 0.
  • for every x in Z, there is an integer x' such that x + x' =0 = x' + x (additive inverse). x' is denoted by -x.

Furthermore, the Group is Abelian:

  • x + y = y + x (commutative).

The set also has a second operation defined on it: multiplication. which is distributive over addition:


X *(y + z) = x * y + x * z.


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Q: What is law of integers?
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What is the law of integers?

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