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describes the theory of fractals and is largely responsible for the current interest in fractal geometry
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Introduced a system for passing secret messages using large primes and a key which could be published
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Ken Appel and Wolfgang Haken prove the four color conjecture with 1200 hours of computer time to examine 1500 conjectures
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Yuri Matiyasevich (1947 - ), a Russian mathematician, showed that "Hilbert's tenth problem" was unsolvable, namely that there is no general method for determining when polynomial equations have a solution in whole numbers.
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Paul J. Cohen proves the independence of the axiom of choice and of the continuum hypothesis
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Meteorologist, Edward Lorenz, discovered a simple mathematical system with chaotic behavior