# XVIII Diffiety School on Geometry of PDEs

The aim of this permanent School is to introduce undergraduate and PhD. students in Mathematics and Physics as well as post-doctoral researchers in a specific area of Mathematics and Teoretical Physics: Secondary Calculus. A diffiety is a geometrical object that properly formalizes the concept of the solution space of a given system of (nonlinear) PDEs, much as an algebraic variety does with respect to solutions of a given system of algebraic equations. Secondary Calculus is a natural diffiety analogue of the standard calculus on smooth manifolds, and as such leads to a very rich general theory of nonlinear PDEs. Moreover, it appears to be a natural language for quantum physics, just as the standard calculus is the natural language for classical physics.

**Submitted by Luca Vitagliano |

**9 / Mar / 2015