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Re:Some memories from meeting Albert Einstein in 1951-52 by kweinber on Monday December 14, 2015 @10:36PM (#10735744)
I had developed a truly marvelous explanation of that paragraph but I couldn't fit it into the margin of this page.
Re:Some memories from meeting Albert Einstein in 1951-52 by theoh on Tuesday December 15, 2015 @12:05AM (#10736055)
It's probably not as complicated as it is being made to sound.

I don't know about the "quasis" but it sounds like a linear algebra problem. Hyperbolic might be the form of the solutions to each of the differential equations, or of their combined solution. "Lorentzian metric" presumably means the usual Minkowski space of relativity.