MATH 1920 Lecture Notes - Lecture 9: Ellipse, Hyperbola

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Definition: a (scalar valued) function of n variables is a function with domain d in n and image/range in . Examples: (, ) = () + cos() Graphs: suppose f is a function of two variables. Its graph is the set {(x,y,f(x,y)); (x, y) Example: what is the graph of (, ) = 21 ) ) By inspection, the domain is the set {(x, y); ) + ) 1} Taking z = 0, this graph is a disk with radius 1 centered at the origin. The graph is a hemisphere with radius 1. Due to the square root, z is non-negative. Studying graphs: look at the traces (horizontal traces are called the level curves) (, ) is the altitude above sea level. Level curves are the contour lines: pressure maps (, ) is the pressure. Level curves are the isobars: temperature maps. (, ) is the temperature at (x,y) Example: (, ) = 23) + 2) + 1.

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