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We study various notions of multivariate functions which map families of positive semidefinite matrices or of conditionally positive semidefinite matrices into matrices of the same type.
Woody plants were sprayed with an aqueous homogenate of the n-butyl ester of 2,4,5-trichlorophenoxyacetic acid. Leaf extracts were studied by gas-liquid chromatography, and 2,4,5-trichlorophenol was always present. The formation of 2,4,5-trichloroanisole apparently did not occur.