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- Unisolvent_functions abstract "In mathematics, a collection of n functions f1, f2, ..., fn is unisolvent on domain Ω if the vectors are linearly independent for any choice of n distinct points x1, x2 ... xn in Ω. Equivalently, the collection is unisolvent if the matrix F with entries fi(xj) has nonzero determinant: det(F) ≠ 0 for any choice of distinct xj's in Ω.Unisolvent systems of functions are widely used in interpolation since they guarantee a unique solution to the interpolation problem. Polynomials are unisolvent by the unisolvence theoremExamples: 1, x, x2 is unisolvent on any interval by the unisolvence theorem 1, x2 is unisolvent on [0, 1], but not unisolvent on [−1, 1] 1, cos(x), cos(2x), ..., cos(nx), sin(x), sin(2x), ..., sin(nx) is unisolvent on [−π, π]Systems of unisolvent functions are much more common in 1 dimension than in higher dimensions. In dimension d = 2 and higher (Ω ⊂ Rd), the functions f1, f2, ..., fn cannot be unisolvent on Ω if there exists a single open set on which they are all continuous. To see this, consider moving points x1 and x2 along continuous paths in the open set until they have switched positions, such that x1 and x2 never intersect each other or any of the other xi. The determinant of the resulting system (with x1 and x2 swapped) is the negative of the determinant of the initial system. Since the functions fi are continuous, the intermediate value theorem implies that some intermediate configuration has determinant zero, hence the functions cannot be unisolvent.".
- Unisolvent_functions wikiPageID "21396688".
- Unisolvent_functions wikiPageRevisionID "590140649".
- Unisolvent_functions cleanup "February 2009".
- Unisolvent_functions hasPhotoCollection Unisolvent_functions.
- Unisolvent_functions refimprove "February 2009".
- Unisolvent_functions subject Category:Approximation_theory.
- Unisolvent_functions subject Category:Interpolation.
- Unisolvent_functions subject Category:Numerical_analysis.
- Unisolvent_functions comment "In mathematics, a collection of n functions f1, f2, ..., fn is unisolvent on domain Ω if the vectors are linearly independent for any choice of n distinct points x1, x2 ... xn in Ω. Equivalently, the collection is unisolvent if the matrix F with entries fi(xj) has nonzero determinant: det(F) ≠ 0 for any choice of distinct xj's in Ω.Unisolvent systems of functions are widely used in interpolation since they guarantee a unique solution to the interpolation problem.".
- Unisolvent_functions label "Unisolvent functions".
- Unisolvent_functions sameAs m.05f3ltt.
- Unisolvent_functions sameAs Q7887012.
- Unisolvent_functions sameAs Q7887012.
- Unisolvent_functions wasDerivedFrom Unisolvent_functions?oldid=590140649.
- Unisolvent_functions isPrimaryTopicOf Unisolvent_functions.