• 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.

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