What is T here? 
What does the T that stands for time represents?
area = length x breadth
Length, non-existing,
Breadth, non-existing,
Area, non-existing,
formula still works...
Why must things be existing for mathematical formulas to work?

1,2,3,4,5.... who says numbers exists other than in people's heads?

How in the world can zero exists?
There is nothing here!
Darkness_hacker99: see? see? see? nothing exists! Otherwise how can
you use it in a sentence?
