deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 5c32dd3..003243b 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
\section{Finding One to One Correspondence}  Find a one-to-one correspondence from the set \mathbb{N} of positive integers to the set \mathbb{Z} of all integers (positive, negative, or zero).  \\ \[ \mathbb{N} \in \> \> \> \>  \{1, \> \> \> \> 2, \> \> \> 3, \> \> \> 4, \> \> \> 5, \> \> \> 6, \> \> \> \ 7 \} \] \[ \downarrow \> \> \> \> \downarrow \> \> \> \downarrow \> \> \> \downarrow \> \> \> \downarrow \> \> \> \downarrow \> \> \> \downarrow \]  \[ \mathbb{Z} \in \{-3, -2, -1,\> \> \> 0,\> \> \> 1,\> \> \> 2, \> \> 3\} \]