# Linear constraint equations

 A linear multi-point constraint requires that a linear combination of nodal variables is equal to zero; that is, $A1⁢uiP+A2⁢ujQ+⋯+AN⁢ukR=0$, where $uiP$ is a nodal variable at node P, degree of freedom i; and the $An$ are coefficients that define the relative motion of the nodes. In Abaqus/Explicit linear constraint equations can be used only to constrain mechanical degrees of freedom. The following topics are discussed:
 Related Topics About Kinematic Constraints In Other Guides *EQUATION Defining equation constraints

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