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Sonja [21]
3 years ago
8

The set of integers is not closed for

Mathematics
1 answer:
Brilliant_brown [7]3 years ago
4 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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