Principle Of Least Action
The
principle of least action
was first formulated by
Pierre-Louis Moreau de Maupertuis
, who said that "Nature is thrifty in all its actions". See
action (physics)
. Others who developed the idea included
Euler
and
Leibniz
. It should be said that, from the point of view of the
calculus of variations
,
principle of stationary action
is more accurate. Earlier,
Pierre de Fermat
had introduced the ideas that rays of light, in optical conditions such as
refraction
and
reflection
, followed a
principle of least time
: see
Fermat's principle
. The principle of least action led to the development of the
Lagrangian
and
Hamiltonian
formulations of classical mechanics. Although they are at first more difficult to grasp, they have the advantage that their world-view is more transferable to the frameworks of
relativistic
and
quantum-mechanical
physics than that of
Newton's laws
. This has caused some people to think that this principle is a "deep" principle of physics.
See also
Action (physics)
Variational principle
Calculus of variations
Functional integral
Fermat's principle
External links
http://www.eftaylor.com/leastaction.html
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