(3/-1) I\'ll wager that you know this mathematician for whom the triangle of binomial coefficients is named.
(6/-2) His 1202 book \"Liber Abaci\" used a now-eponymous sequence of numbers to model the growth of a population of rabbits.
(9/-3) In \"The Fractal Geometry of Nature,\" he observed that “clouds are not spheres, mountains are not cones . . . and lightning does not travel in a straight line.”
(12/-4) This prolific mathematician was featured on a Swiss 10-franc note alongside the bridges of Königsberg.
(15/-5) The \"Incompleteness Theorems\" that bear this logician\'s name imply that, within any consistent formal axiomatic system of mathematics, there must be true statements that are unprovable.