Bilinear map, a type of mathematical function between vector spaces
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Bilinear transform, a method of transforming from the S to Z domain in control theory and signal processing
Eugenio Beltrami and Camille Jordan discovered independently, in 1873 and 1874 respectively, that the singular values of the bilinear forms, represented as a matrix, form a complete set of invariants for bilinear forms under orthogonal substitutions.