The Stephen Hawking memorial lecture; page 5.
A Formal Statement of Quantum-Relativity (qr).
1.i0/(-1.i1) (the front-left case or the rear-right case)
and 1.i0/(-1.i1) (the front-right case or the rear left case)
however, ignore the quantum ambiguity, basically this is just one unit of space per unit of inverted historic depth
GRAVITATIONAL
HINT: The so-called "graviton" has a zero apparent radius, integrate Einstein's field equations, just as they stand.