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Fundamental Solution may refer to:
A special distributional solution of a linear differential operator used to build solutions via convolution (Green’s-function framework).
For certain linear ODEs, a matrix (or set of functions) whose columns generate solutions of the homogeneous system (fundamental matrix).
The canonical fundamental solution of the Laplace operator, e.g., proportional to 1/r in 3D and log(r) in 2D, underlying harmonic and potential theory.