Functions of one and two variables.

Description
Functions of one and two variables are defined with examples. How to represent a given function graphically is discussed. Contow plot is defined and explained. Examples of contow plots are analysed. The formula of partial derivative of a function is derived.
Prof. Denis Auroux, Maths, Fall 2007,18.02 Multivariable Calculus: 8: Partial Derivatives, Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed August 16,2011). License: Creative Commons BY-NC-SA:http://ocw.mit.edu/terms/#cc