# Math Help - proof floor function

1. ## proof floor function

Can you help me to solve this please ?

2. Here are some examples.
$g^{ - 1} \left( {\{ 2\} } \right) = [2,3)\;\& {\kern 1pt} g^{ - 1} \left( {\{ - 1, - 2\} } \right) = [ - 2,0)\,$

Now you try.