On Pg 28, Question 26 of this book, the author writes
Define $g:2^{[2]}\rightarrow \mathbb{Z}$ by the rule $g(S) = |S|$ where $S$ is any subset of $[2]$. Write $g$ as a set of ordered pairs.
I don't need the answers, just what it means.
On Pg 28, Question 26 of this book, the author writes
Define $g:2^{[2]}\rightarrow \mathbb{Z}$ by the rule $g(S) = |S|$ where $S$ is any subset of $[2]$. Write $g$ as a set of ordered pairs.
I don't need the answers, just what it means.
I assume that $[n]$ is the set of positive integers $\{ 1, 2, ... n \}$ and that for $S$ a set, $2^S$ is the set of all subsets of $S$. (The idea being that $|2^S| = 2^{|S|}$.)