Browsing Revista Colombiana de Matemáticas by Author "Rao, D. K."
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A triangle inequality for angles in a hilbert space
Rao, D. K.Let x,y,z be unit vectors in a Hilbert space, and define the angle θxy by cos θxy = Re (x,y), 0 ≤ θxy ≤ π. The object this note is to give a proof of the following inequality (1) θxz and lt; θxy + θyz .Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.