How to implement normalization Constraint and Single Value variable in Parallel Setting?

General Discussion
1

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I am doing a lagrange-multipliers problem similar to what is in the page
https://doc.freefem.org/examples/finite-element.html#lagrange-multipliers
but I am not sure how to set up normalization constrant and the single value variable l. Can someone show me the code piece with decomposed mesh.

2

it gives error when I throw in the single column into the Mat block matrix.

3

Please see the example from https://github.com/FreeFem/FreeFem-sources/blob/master/examples/hpddm/laplace-lagrange-PETSc.edp.

4

thanks. Very helpful