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24 September, 09:17

The set of integers is not closed for

(1) division (3) addition

(2) multiplication (4) subtraction

+3
Answers (1)
  1. 24 September, 09:29
    0
    Hello,

    N is closed for an opération (µ) means that

    a, b ∈ N : a µ b ∈N (i suppose so)

    Answer (1) ex 2/3 ∉ N

    Answer (4) ex 2-3 ∉ N

    ∀ a, b ∈ N: a+b ∈N is true; not a answer.

    ∀ a, b ∈ N: a*b ∈N is true; not a answer.
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