ATLAS Offline Software
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#include <IKinematicConstraint.h>
Kinematic constraints are implemented as a set of equation that depend on the cartesian coordinates of the kinematic particles. Constraint-equations used by the KinematicVertexFitter are implemented in a general form which contains: a vector with the current values of each constraint-equation for a given set of KinematicParticle and a matrix with the derivatives of the constraint-equations vs the cartesian coordinates of the particles