Reality checkby Bondo Wyszpolski“The Rigor of Angels: Borges, Heisenberg, Kant, and the Ultimate Nature of Reality,” by William Egginton (Pantheon, 338 pp, $32)The subtitle should immediately clear the house, but those who remain are in for a ride. William Egginton has corralled three pilgrims from different disciplines, and shows how each of them trekked up the mountain we call Reality. Or, to put this another way, the Argentine fabulist Jorge Luis Borges (1899-1986), German phy






