GEOMETERS are wont to speak (it seems to me) somewhat laxly of “the line at infinity” as if there were only one such line in a plane; in a certain but not in the most obvious sense this is true—viz.

Is our 3-D universe is just the inward projection of an infinitely distant boundary? Space seems fundamental. Many physicists now think that the fabric of space emerges from something deeper. And the ...

Physicists have been busy exploring how our universe might emerge like a hologram out of a two-dimensional sheet. New clues have come from the symmetries found on an infinitely distant “celestial ...