31. The only possible measurement is between any two orthogonal states ( an orthonormal basis ). 32. The sines and cosines in the Fourier series are an example of an orthonormal basis. 33. The columns of the matrix form another orthonormal basis of " V ". 34. Each orthonormal basis is a Parseval frame, but the converse is not always true. 35. The primary method to construct a complex null tetrad is via combinations of orthonormal bases. 36. Two wave functions and are orthonormal . 37. An orthonormal basis for Minkowski space necessarily consists of one timelike and three spacelike unit vectors. 38. The resulting ordered orthonormal basis is precisely the "'TNB "'frame. 39. It estimates as an orthonormal matrix. 40. Every countable orthonormal basis is equivalent to the standard unit vector basis in ! 2.
