David Berlinsky, A Tour of the Calculus. New York: Pantheon Books, 1995, p. 199.

"The study of the way in which the arts mirror developments in mathematics is a fascinating one. Lipman Bers began a memorable lecture on non-Euclidian geometry by comparing the Declaration of Independence with Lincoln's Gettysburg Address. "We hold these truths to be self-evident," he rumbled in his Russian-accented English, quoting the Delcaration, "that all men are created equal." And then he cited Licoln's enormously cagy address: "... conceived in liberty and dedicated to the proposition that all men are created equal." The class of native-born Americans realized with a shock that Bers had discerned something we had never seen: Lincoln's frank unwillingness to commit himelf unequivocally to the propositions he was citing. Why the difference? Bers would ask. The discovery of non-Euclidean geometries in the early part of the nineteenth century, he would rumble on, an interesting if playful and irresponsible answer."

Changes in role of mathematical thinking and our world view

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