- (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 â€œclouds are not spheres, mountains are not cones . . . and lightning does not travel in a straight line.â€
- (12/-4) This prolific mathematician was featured on a Swiss 10-franc note alongside the bridges of KÃ¶nigsberg.
- (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.
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