How would I show the following have a bijection. Which is one to one and onto ofcourse.

$\mathbb{Z}\rightarrow \mathbb{N}$

I know I need to find a function. But I do not see the pattern that makes integer go to natural. I already did this problem from natural to integer but now I want to see it done this way.

I have listed some numbers

$,..,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,..$

$1,2,3,4,5,6,7,8,9,10,11,12,13,14,.$


Question: prevent menustrip from being selected by pressing alt
Answer: This is why, on Windows, you do not use ALT+key shortcuts. You should not attempt to subvert the native system behaviour. The solution is to choose a different shortcut combination.