For given interval and polynomial system, this function computes the Krawczyk operator.
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Intervals for certification should be given as a Matrix, and we set the relationships between variables and intervals by aligning them in the order of variables of the polynomial ring. For constructing a proper interval box from a given point, see the function pointToInterval.
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If the Krawczyk operator is contained in the input interval, then we conclude that the input interval (or the Krawczyk operator) contains a unique root of the system.
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The function krawczykTest checks this criterion automatically.
The object krawczykOperator is a method function.