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Given a function [latex]f\,(x,\ y)[/latex] and a number [latex]c[/latex] in the range of [latex]f[/latex], a level curve of a function of two variables for the value [latex]c[/latex] is defined to be the set of points satisfying the equation [latex]f\,(x,\ y)=c[/latex].
The level curves of f(x, y) are curves in the xy -plane along which f has a constant value. The level surfaces of f(x, y, z) are surfaces in xyz -space on which f has a constant value. Sometimes, level curves or surfaces are referred to as level sets.
Nov 16, 2022 · The level curves of the function \(z = f\left( {x,y} \right)\) are two dimensional curves we get by setting \(z = k\), where \(k\) is any number. So the equations of the level curves are \(f\left( {x,y} \right) = k\).
Example 1. Let $f(x,y) = x^2-y^2$. We will study the level curves $c=x^2-y^2$. First, look at the case $c=0$. The level curve equation $x^2-y^2=0$ factors to $(x-y)(x+y)=0$. This equation is satisfied if either $y=x$ or $y=-x$. Both these are equations for lines, so the level curve for $c=0$ is two lines.
Dec 29, 2020 · Given a function \(z=f(x,y)\), we can draw a "topographical map'' of \(f\) by drawing level curves (or, contour lines). A level curve at \(z=c\) is a curve in the \(x\)-\(y\) plane such that for all points \((x,y)\) on the curve, \(f(x,y) = c\).
A level set of a function of two variables $f(x,y)$ is a curve in the two-dimensional $xy$-plane, called a level curve. A level set of a function of three variables $f(x,y,z)$ is a surface in three-dimensional space, called a level surface.
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Overview. In this session you will: Watch a lecture video clip and read board notes. Read course notes and examples. Watch two recitation videos. Work with a Mathlet to reinforce lecture concepts. Do problems and use solutions to check your work. Lecture Video. Video Excerpts. Clip: Level Curves and Contour Plots.
