A real function of n real variables; domain of definition; geometric interpretation for n = 2, and for each n. Limit, Contiguous. Partial derivatives; differentiability, the equation for the plane tangent to the surface for n = 2; the chain rule; Taylor formula, stationarypoints for n = 2: maximum, minimum; saddle point, Jacobean. Full differential; derivatives of implicit functions f (x, y) = O; plane tangent to the surface f (x, y, z) = O; maximum and minimum with constraints: Lagrange multiplicators.

Derivatives from the integrals; 2-dimentional integral, change of variables; 3-dimentional integral; cylindrical and spherical coordinates; integrals over lines, the integral of a full differential.  Green's theorem.

Variation calculation.