Please come Saturday, April 27 from 2-6 pm to

O-R-G small softwares
38 Ludlow Street, Basement
New York, NY 10002

where mathematician Philip Ording will launch and sign 99 VARIATIONS ON A PROOF, just published by Princeton University Press. Limited edition silkscreened covers will be available in a spectrum of colors.

Riffing on Raymond Queneau's classic Exercises in Style, 99 VARIATIONS explores the possible meanings of style for mathematics — as a science and an art — by approaching the solution of a single equation in nearly a hundred different ways.

The launch will be punctuated by a repeated violin duet starting at 2 pm. The performance by Élise Le Bihan and Lily Kahan constitutes an auditory proof. A chromatic proof is above. That leaves 97.

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Pre-print courtesy The Serving Library

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Image caption: The two spectra represent the two sides of the equation x^3 − 6x^2 + 11x − 6 = 2x − 2. At height x the hue on the left is proportional to f(x) = x^3 − 6x^2 + 11x − 6 and the hue on the right is proportional to g(x) = 2x − 2. A unit corresponds to a difference of 40 degrees in hue. The red band (0 degrees) at x = 1 and the blue band (240 degrees) at x = 4 are the two solutions.