Most tough to understand for me was the inital proof of 2^A being equivalent to P(A). Where does this proof come from? Well, I know that we used it for finding cardinality but where does the actual proof come from? How would we think to make a function equal to that piecewise function?
That being said, it was neat that out of nowhere this function comes from the set of subsets and it relates the pairs of elements of P(A) and 2^A. I don't quite understand it, but it works out nicely. Other than that, this section is really short and I don't have a lot else to say!
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