The sign in front of u in the constraint controls the sign of the implicit Lagrange multiplier μ, as well as the sign of reaction forces computed using the reacf() operator. For consistency with the way predefined physics interfaces implement constraints, write 2-u rather than u-2 in R.
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See Coefficient Form PDE for all the settings and Compact and Standard Notations for Classical PDEs for the equations that the Classical PDE interface solves.
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