Find a function of two variables with these propertes. .

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SUMMARY

The discussion focuses on finding a function of two variables, F(x,y), whose level curves are parabolas with a vertex at (0,0) and a hole at the origin. Participants suggest that the level curves can be represented by the equation y = ax², where 'a' is a constant. The conversation highlights that the solution for F(x,y) is not unique and encourages exploration of the full family of solutions. Additionally, the gradient of F(x,y) is noted to be perpendicular to the level curves, which serves as a useful verification tool.

PREREQUISITES
  • Understanding of multivariable calculus concepts, specifically level curves.
  • Familiarity with parabolic equations and their properties.
  • Knowledge of gradients and their geometric interpretations.
  • Basic skills in function notation and manipulation in two variables.
NEXT STEPS
  • Explore the concept of level curves in multivariable functions.
  • Research the properties of parabolic equations and their applications.
  • Study the implications of holes in level curves and their effect on function continuity.
  • Investigate the full family of solutions for multivariable functions with specific level curve characteristics.
USEFUL FOR

Students and educators in mathematics, particularly those studying calculus and multivariable functions, as well as anyone interested in the geometric interpretation of functions and their level curves.

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Homework Statement


Find a function of two variables whose level curves are parabolas with vertex (0,0) with a hole in the parabolas at the origin.


Homework Equations


No special equations come to mind.
4ay=x2 may be a little useful.


The Attempt at a Solution



The first thing I thought of was y=x3/x, but that doesn't include the third variable. I know the parabolas can have any value for a or face any direction, but I do not know how to include z so that the function will remain having level curves as stated.

Are there any other functions with these properties? Any input will be appreciated.
 
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so i assume by z you mean the function z = F(x,y) we are trying to find?

so we have the level curves of z = F(x,y), given by F(x,y) = c, for some constant a, are given by y = ax^2, for some constant a.

What if we set the constants the same?

F(x,y) = a --> y = a^x2
hopefully this will get you started...

a few other things to consider.
- The solution for F(x,y) is not uniquie - can you find the full family of solutions?
- The gradient of F(x,y) will be perpindicular to a level curve at any point, useful check
- The levels curevs have a "hole" at (0,0), why & what does this imply for F(x,y)?
 

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