In mathematics, the biharmonic equation is a fourth-order partial differential equation which arises in areas of continuum mechanics, including linear elasticity theory and the solution of Stokes flows. It is written asororwhere is the fourth power of the del operator and the square of the laplacian operator (or ), and it is known as the biharmonic operator or the bilaplacian operator.

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• In mathematics, the biharmonic equation is a fourth-order partial differential equation which arises in areas of continuum mechanics, including linear elasticity theory and the solution of Stokes flows. It is written asororwhere is the fourth power of the del operator and the square of the laplacian operator (or ), and it is known as the biharmonic operator or the bilaplacian operator. In summation notation, it can be written in dimensions as: For example, in three dimensional cartesian coordinates the biharmonic equation has the form As another example, in n-dimensional Euclidean space,wherewhich, for n=3 and n=5 only, becomes the biharmonic equation.A solution to the biharmonic equation is called a biharmonic function. Any harmonic function is biharmonic, but the converse is not always true.In two-dimensional polar coordinates, the biharmonic equation iswhich can be solved by separation of variables. The result is the Michell solution.
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• In mathematics, the biharmonic equation is a fourth-order partial differential equation which arises in areas of continuum mechanics, including linear elasticity theory and the solution of Stokes flows. It is written asororwhere is the fourth power of the del operator and the square of the laplacian operator (or ), and it is known as the biharmonic operator or the bilaplacian operator.
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• Équation biharmonique
• Biharmonic equation
• Biharmonische Funktion
• Ecuación biarmónica
• Бигармоническая функция
• 重調和方程式
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