claim: Chinatown's screenplay was by Robert Towne.
evidence: Nikolai Nikolaevich Nekhoroshev -LRB- Николаи Николаевич Нехорошев 2 October 1946 -- 18 October 2008 -RRB- was a prominent Soviet Russian mathematician , specializing in classical mechanics and dynamical systems .. Soviet. USSR. classical mechanics. classical mechanics. dynamical systems. dynamical systems. His research concerned Hamiltonian mechanics , perturbation theory , celestial mechanics , integrable systems , dynamical systems , the quasiclassical approximation , and singularity theory .. dynamical systems. dynamical systems. Hamiltonian mechanics. Hamiltonian mechanics. perturbation theory. perturbation theory. celestial mechanics. celestial mechanics. quasiclassical approximation. quasiclassical approximation. singularity theory. singularity theory. He proved , in particular , a stability result in KAM-theory stating that , under certain conditions , solutions of nearly integrable systems stay close to invariant tori for exponentially long times .. KAM-theory. Kolmogorov–Arnold–Moser theorem. Nekhoroshev was professor of the Moscow State University and University of Milan .. Moscow State University. Moscow State University. University of Milan. University of Milan. He is an alumnus of Moscow 's boarding school no. 18 -LRB- 1964 -RRB- .