Quote - Third, time in Einstein's mathematics is not imaginary.

Yes it is, the time coordinate is u = ict.
The imaginary number doesn't appear in an explicit way in Einstein's theory because appears squared and the square of an imaginary number is real.
The geodesic equation used by Einstein is
ds^2 = du^2 - dx^2 - dy^2 - dz^2
If time was real the geodesic equation should have been
**ds^2 = du^2 + dx^2 + dy^2 + dz^2

Well, is much worst, in Einstein's geodesic aquation the mimus sign is inverted so it looks as the time is real and the x,y,z coordinates are imaginary.**

Stupidity also evolves!