What is meant by commutativity?

Answer 1

Usually commutating Capacitors are used in bistable multivibrators.

To change the states of two transistors in bistable MVs, a trigger is applied.

But due to the capacitance at base of transistor it takes sometime (delay) to change the state.

To overcome this problem Commutating capacitors are used.

So these are also known as Speed up capacitors or Transpose Capacitors as they speed up the operation.