Quantum Computing, Quantum Computer, Qiskit, Quantum Physics, Python.
np.array([[1,0]]).T; v0 array([[1], [0]]) # Here it is created again de X matrix X = np.array([[0,1],[1,0]]); X array([[0, 1], [1, 0]]) # Multiplying v0 by the X matrix twice you get again v0 X.dot(X).dot(v0) array([[1], [0]]) # Multiplying the X matrix by itself you get the Identity matrix