The 4 dimensional space-time continuum is usually represented by three real space coordinates: x, y, z and by one imaginary time coordinate ������ where �� is the imaginary unity, �� is the constant speed of light, and �� is the time variable. A point P(��, ��, ��, ������) represents an event in the space-time continuum. However, the fundamental quadratic Pythagorean form of the interval between two events is given by: (����)² = ��₁₁����¹����¹+��₂₂����²����²+��₃₃����³����³ + ��₄₄����⁴����⁴ where ��= ��¹, ��= ��², ��= ��³, ��= ��⁴, and ��₁₁= ��₂₂= ��₃₃= ��₃₃=1, but ��₄₄= -1. The matrix [��(��,��)] is known as the symmetric metric tensor of rank 2 where all component off the main diagonal are zeros. However, for a quantum theory of the space-time continuum, the totality of the continuum is given by �� which represents an arbitrary two dimensional hypersurface in four dimensions and equivalently is the product of the totality of energy (��) and constant light speed (��): ��=����. Together with the totality of the infinitesimal quantized squares of energy ��=����������, the absolute linear momentum (��) can be defined as the dimensional ratio ��/�� and for ��=��², the linear momentum is reduced to the general covariance of photon momentum ��=��/�� and is simply Planck’s constant of action (��) divided by the wavelength �� of the photon: ��= ��/��. These formulations imply that the temporal frequency (��) is equivalent to the spatial frequency (ƒ) of physical reality.