A set of vectors in Euclidean 
-space is said to satisfy the Haar condition if every set of
vectors is linearly
independent (Cheney 1999). Expressed otherwise, each selection of 
vectors from such a set is a basis for 
-space. A system of functions satisfying the Haar condition
is sometimes termed a Tchebycheff system (Cheney 1999).
Haar Condition
This entry contributed by Ronald M. Aarts
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References
Cheney, E. W. Introduction to Approximation Theory, 2nd ed. Providence, RI: Amer. Math. Soc., 1999.Referenced on Wolfram|Alpha
Haar ConditionCite this as:
Aarts, Ronald M. "Haar Condition." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/HaarCondition.html