Answer to Question #207601 in Discrete Mathematics for manatee

Question

Let A be a set and B be some fixed subset of A. Define a relation R on P(A) as follows:

X1RX2 iff X1 U B = X2 U B

for all X1, X2 in P(A). It is known that R is an equivalence relation on P(A).

For A = N and B = {1, 2}, enumerate the elements of [{2, 3}]R.

Answer 1

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