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Please note that old diffiety site is available at diffiety.ac.ru. Very old diffiety school site (school.diffiety.org) is available here. More recent information about diffiety schools can be found here. For the latest school see “Most Recent School”

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This site facilitates communication of Diffety research group. The aim is to discuss various Diffiety-related concepts in blogs and comments, develop lecture notes interactively and publish more robust material in pdf/tex form. For technical details see FAQ/HowTo section.

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Diffiety formalizes the concept of the solution space of a given system of (non-linear) PDEs – much like an algebraic variety does with respect to solutions of a given system of algebraic equations.