February 29th, 2012, 08:06 PM  #1 
Newbie Joined: Feb 2012 Posts: 2 Thanks: 0  Lagrangian Help
My wife is being stubborn and is neglecting to ask for help, so I'm here with sparse information in order to help. For her nonlinear optimization class... She says she is trying to rewrite the lagrangian as f(x) *lambda*, *something that looks like the letter C in greek* If anyone can help or point me in the right direction as to 1) what she is trying to do, 2) where she could find out how to rewrite it, 3) help in general. P.s. sorry I can't code or do the cool letters/symbols. Thanks! 
February 29th, 2012, 08:14 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 463 Math Focus: Calculus/ODEs  Re: Lagrangian Help
These articles may help: http://en.wikipedia.org/wiki/Lagrange_multiplier http://mathworld.wolfram.com/LagrangeMultiplier.html Many others can be found by googling "Lagrange multiplier." 
February 29th, 2012, 08:23 PM  #3 
Newbie Joined: Feb 2012 Posts: 2 Thanks: 0  Re: Lagrangian Help
She gave me another key word through her frustration: it's a "minimization" problem Thanks for the help. 
March 1st, 2012, 04:27 PM  #4 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Lagrangian Help
If she knows how to maximize f(x), but she needs to minimize it instead, have her maximize the function g(x) = f(x) instead.


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