Which of the following is not a Maxwell equation?

• A. (∂t/∂v) = -(∂p/∂s)
• B. (∂t/∂p) = -(∂v/∂s) c) (∂p/∂t) = (∂s/∂v) d) (∂v/∂t) = -(∂s/∂p)