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Lagrangian mechanics

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Joseph-Louis Lagrange
Mathematician and astronomer (1736–1813)
Lagrangian point
one of five positions in an orbital configuration of two large bodies where a small object can maintain a stable relative position
Lagrangian mechanics
formulation of classical mechanics based on the Lagrangian function on the tangent bundle of configuration space
action
physical quantity of dimension energy × time
D'Alembert's principle
principle
generalized coordinate
parameters that describe the configuration of the system relative to some reference configuration
classical field theory
physical theory describing classical fields
Hamilton's principle
principle that the dynamics of a physical system are determined by a variational problem of the Lagrangian
halo orbit
periodic, three-dimensional orbit near the L1, L2 or L3 Lagrange points in the three-body problem of orbital mechanics
Lissajous orbit
quasi-periodic orbital trajectory
total derivative
derivative of a function of several variables with respect to one variable, without the others held constant
Lyapunov stability
property of a dynamical system where solutions near an equilibrium point remain so
Virtual displacement
Displacement in analytical mechanics
Canonical coordinates
sets of coordinates which can be used to describe a physical system at any given point in time
generalized force
in analytical mechanics, the rate of change of the virtual work along generalized coordinates
Jacobi coordinates
simplification of coordinates for an n-body system
Rayleigh dissipation function
function used in Lagrangian mechanics
tautological one-form
canonical differential form defined on the cotangent bundle of a smooth manifold
Monogenic system
type of system in classical mechanics
minimal coupling
field theory coupling of charge but not higher moments
Scleronomous
A mechanical system is scleronomous if the equations of constraints do not contain the time as an explicit variable and the equation of constraints can be described by generalized coordinates. Such constraints are called scleronomic constraints. The opposite of scleronomous is rheonomous.