General Solution
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In mathematics, a weak solution (also called a generalized solution) to an ordinary differential equation|ordinary or partial differential equation is a function (mathematics)|function for which the derivatives may not all exist but which is nonetheless deemed to satisfy the equation in some precisely defined sense. There are many different definitions of weak solution, appropriate for different classes of equations. One of the most important is based on the notion of distribution (mathematics)|distributions.Avoiding the language of distributions, one starts with a differential equation and rewrites it in such a way that no derivatives of the solution of the equation show up (the new form is called the weak formulation, and the solutions to it are called weak solutions). Somewhat surprisingly, a differential equation may have solutions which are not differentiable; and the weak formulation allows one to find such solutions.Weak solutions are important because a great many differential...
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