Between two scalar potentials, interferometry is:

• Interference of the multi-wave sets in hyperspace

• Production of gradients in the 3-space point values

• In the classical (erroneous) postulation, the creation of forces in 3-space.

  • Force does not exist until the gradient couples to an observable mass.

  • There are no E-fields and B-fields as such in the massless vacuum, but only potential gradients.