One of the mysteries of the English language finally explained.
1(Of a function) having negative (formerly: negative or zero) values for all non-zero values of its argument.
2(Of a square matrix) having all its eigenvalues negative.
3(Of an operator on a Hilbert space) such that the inner product of any element of the space with its image under the operator is less than zero.
Mid 19th century; earliest use found in Proceedings of the Royal Society of London.
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