In mathematics a diffiety, is a geometrical object introduced by Vinogradov (1984) playing the same role in the modern theory of partial differential equations as algebraic varieties play for algebraic equations.
Another way of generalizing ideas from algebraic geometry is differential algebraic geometry.
- Vinogradov, A. M. (1984), "Local symmetries and conservation laws", Acta Applicandae Mathematicae, 2 (1): 21–78, MR 736872, doi:10.1007/BF01405491
- Aleksandr Mikhaĭlovich Vinogradov (2001), Cohomological analysis of partial differential equations and secondary calculus, AMS Bookstore, ISBN 978-0-8218-2922-6
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