# Math Help - inverse metric tensor

1. ## inverse metric tensor

I have gone through and kind of see how ds^2=g_ij*dx^i*dx^j where g_ij=dy^m/dx^i*dy^m/dx^j. How does one show the inverse metric tensor (g^ij) is equal to dx^i/dy^m*dx^j/dy^m?

2. I can guess that $x^n$ are the coordinates in some coordinate system but what is $y^m$? A different coordinate system?

3. yes the x and y are of two different sytems (unbarred and barred) where dy^m=dy^m/dx^j*dx^j