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| | XIth Oporto meeting on geometry, topology and physics: Courses |
 | | Informally, Secondary Calculus may be viewed as Primary (="usual") Calculus respecting underlying geometrical structures on diffieties. |
 | | Vinogradov, Geometry of Jet Spaces and Nonlinear Differential Equations, Advanced Studies in Contemporary Mathematics, 1 (1986), Gordon and Breach, New York, London. |
 | | J. Krasil'shchik and A. Verbovetsky, Homological methods in equations of mathematical physics, Advanced Texts in Mathematics, Open Education & Sciences, Opava, 1998, Diffiety Inst. |
| diffiety.org /students/special/oporto.htm (764 words) |
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