There's just one equation in his essay, for illustrative purposes. This one:
E2 = c2p2 + m2c4
in which you'll have to imagine the numbers being placed higher than the letters as I can't replicate that here.
Luigi Fantappie in 1941 changed his entire world-view when presented with the implications of Advanced wave potentials intersecting the time variance of present events. He noted that retarded waves govern the law of entropy, well-known and accepted in the continuum of universal evolution, but that advanced waves also must, by default, play a part via the symmetrical system-variant he came to call 'Syntropy'. In language, there's always room for a new word. And when one comes about, we are drawn to inevitable conclusions as to relativity in its subscription. For some, like myself, it's pretty impossible to ignore a correlation between 'syntropy' and 'synchrony', from which we might extrapolate further towards 'synchronicity', and possibly deduce that the avalanche of evidence we see in daily life for there being such a thing as 'synchronicity' is probably related to Syntropy, by virtue of its entering our world-line from a position of prognostication.
Far from it, it seems to me, for only humans build one-way streets into the order of their worlds. Nature insists on two-way streets and symmetry positively relies on them. SUSY took it all a step too far. Sometimes we're not as smart, or as authoritative, as we like to think we are.
Schroedinger relied on forward motion of time (Retarded potentials only) in determining his wave equation, but the d'Alambert operator yields a dual-wave equation which cancels out the need for hidden variables (Bells' Theorem) and allows living systems the quality of absorption in their time-frame, which makes sense not only of concentrated solutions, but of the tendency we have to respond to emitted stimuli, absorb that information, and emit a response correspondingly. We don't choose the stimuli to which we need to respond, but we choose (as far as personality will permit) how to respond to it, and therefore what we emit, which others in turn have the opportunity to respond to, in the never-ending cycles of cause and effect.