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Lagrange’s equation and its Application
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LAGRANGE’S LINEAR EQUATION:
A linear partial differential equation of order one, Involving a dependent variable z and two independent variables x and y and is of the form Pp + Qq = R where P, Q, R are the function of x, y, z.
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Solution of the linear equation:
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MATHEMATICAL PROBLEM
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Applications of Lagrange multipliers
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EconomicsConstrained optimization plays a central role in economics. For example, the choice problem for a consumer is represented as one of maximizing a utility function subject to a budget constraint. The Lagrange multiplier has an economic interpretation as the shadow price associated with the constraint, in this example the marginal utility of income. Other examples include profit maximization for a firm, along with various macroeconomic applications.
Control theoryIn optimal control theory, the Lagrange multipliers are interpreted as costate variables, and Lagrange multipliers are reformulated as the minimization of the Hamiltonian, in Pontryagin's minimum principle.
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Nonlinear programming
The Lagrange multiplier method has several generalizations. In nonlinear programming there are several multiplier rules, e.g., the Caratheodory-John Multiplier Rule and the Convex Multiplier Rule, for inequality constraints
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