The Calculus of Variations: An Introduction
The Calculus of Variations: An Introduction
By Kolo Sunday Goshi
Some Greek Mythology
Queen Dido of Tyre
? Fled Tyre after the death of her husband ? Arrived at what is present day Libya
Iarbas' (King of Libya) offer
? "Tell them, that this their Queen of theirs may have as much land as she can cover with the hide of an ox."
What does this have to do with the Calculus of Variations?
What is the Calculus of Variations
"Calculus of variations seeks to find the path, curve, surface, etc., for which a given function has a stationary value (which, in physical problems, is usually a minimum or maximum)." (MathWorld Website)
Variational calculus had its beginnings in 1696 with John Bernoulli
Applicable in Physics
Calculus of Variations
Understanding of a Functional Euler-Lagrange Equation
? Fundamental to the Calculus of Variations
Proving the Shortest Distance Between Two Points
? In Euclidean Space
The Brachistochrone Problem
? In an Inverse Square Field
Some Other Applications Conclusion of Queen Dido's Story
What is a Functional?
The quantity z is called a functional of f(x) in the interval [a,b] if it depends on all the values of f(x) in [a,b].
Notation
? Example
b
z f x
a
1
x2
1
cos
0
x2
dx
0
................
................
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