Question

∈ℤ
What does this refer to?

Answer 1

(something) is a member of the set "Z."

5 is a member of the set {1, 2, 3, 4, 5, 6}

Answer 2

ℤn means {[0], [1], [2], ...[n−1]} with addition and multiplication modulo n.
a ∈ S means a is an element of the set S;[7] a ∉ S means a is not an element of S.[7]

Answer 3

bc. we know that Z mean integer numbers set so this refer to this integer number set

than you write x∈ℤ so this mean that x is an integer number from Z what is the integer numbers set

hope helped

Answer 4

Raees ,do you agree it please ?