Question

2. If a set is equivalent to a proper
subset of itself then it is​

Answer 1

Answer:

An infinite set is a set which is equivalent to a proper subset of itself. For example, the set of integers is equivalent to the set of even integers--a proper subset (to see this, just note f(n)=2n is a one-to-one function from the integers to the even integers). This definition has some amusing consequences.