Question

which of these sets are equal?
Z is all integers

A = the set of n in Z such that the cardinality of n <2
B= the set of n in Z such that n^3 = n
C = the set of n in Z such that n^2 <= n
D = the set of n in Z such that n^2 <=1
E = the set of -1, 0, 1

Answer 1

B, D, E is the answer I think