triangle inequality
Proper noun
  1. (analysis) The inequality that states that the magnitude of the sum of two vectors is less than or equal to the sum of the magnitudes of the vectors, or any equivalent inequality in other spaces.
    \|\mathbf x + \mathbf y\| \leq \|\mathbf x\| + \|\mathbf y\|
  • French: inégalité triangulaire
  • German: Dreiecksungleichung
  • Italian: disuguaglianza triangolare
  • Portuguese: desigualdade triangular
  • Russian: нера́венство треуго́льника
  • Spanish: desigualdad del triángulo

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