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Orthogonality

"Orthogonal" redirects here. Not to be confused with Orthogonal (book series).
The line segments AB and CD are orthogonal to each other.

In mathematics, orthogonality is the generalization of the geometric notion of perpendicularity. Whereas perpendicular is typically followed by to when relating two lines to one another (e.g., "line A is perpendicular to line B"),[1] orthogonal is commonly used without to (e.g., "orthogonal lines A and B").[2]

Orthogonality is also used with various meanings that are often weakly related or not related at all with the mathematical meanings.

  1. ^ "perpendicular". Merriam-Webster.com Dictionary. Merriam-Webster.
  2. ^ "orthogonal". Merriam-Webster.com Dictionary. Merriam-Webster.

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