Section 2.3: Intro to Partial Differentiation

00:00 -- Introduction and motivation with example of a function of two variables: the twisting of a molecule
01:20 -- Definition of partial derivative of a multivariable function as limit of change in the function with respect to a single variable
04:24 -- Example of calculating the partial derivative of a function from first principles (using the limit of the change in the function)
07:05 -- Examples of finding partial derivatives for functions of several variables
11:30 -- Visualization of what the partial derivative represents (derivative of the curve on the surface where the surface meets the plane)