Gram Determinant

The Determinant

$$G(f_1,f_2,\ldots,f_n) = \left\vert\matrix{ \int f_1^2\,dt & ... ...dt & \int f_1f_n\,dt & \cdots & \int f_n^2\,dt\cr}\right\vert.$$

See also Gram-Schmidt Orthonormalization, Wronskian

References

Sansone, G. Orthogonal Functions, rev. English ed. New York: Dover, p. 2, 1991.