Publicado

1976-07-01

A triangle inequality for angles in a Hilbert space

Palabras clave:

Unit vectors, Hilbert space, triangle inequality (es)

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Autores/as

  • D. K. Rao Universidad del Valle

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  < θxy  + θyz .