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Jun17-10, 07:54 PM
P: 21,293
Right. I just wanted to make sure you understood what was meant here. To show that the set A = {x | -1 < x < 1} has the same cardinality as set B = {x | -2 < x < 2}, you need to find a one-to-one function that maps each element of A to an element of B. There is a very simple function that does that.