# \#mathoptinterface

**URL:** https://discourse.julialang.org/tag/mathoptinterface/1823.md

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## [Lagrange multipliers of a \`VectorNonlinearOracle\` after solve](https://discourse.julialang.org/t/lagrange-multipliers-of-a-vectornonlinearoracle-after-solve/134236)

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**Author:** [@franckgaga](https://discourse.julialang.org/u/franckgaga)\
**Replies:** 1\
**Last updated:** [November 30, 2025, 7:39pm UTC](https://discourse.julialang.org/t/lagrange-multipliers-of-a-vectornonlinearoracle-after-solve/134236 "2025-11-30T19:39:32Z")

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I have a nonlinear optimization problem that relies on MOI.VectorNonlinearOracle for the constraints. I would like to compute the Hessian of the Langrangian at the optimum after solving, or, in other words, fetching the r…

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## [HiGHS instance and model when used in a shared library](https://discourse.julialang.org/t/highs-instance-and-model-when-used-in-a-shared-library/133823)

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**Author:** [@asprionj](https://discourse.julialang.org/u/asprionj)\
**Replies:** 7\
**Last updated:** [November 24, 2025, 9:29am UTC](https://discourse.julialang.org/t/highs-instance-and-model-when-used-in-a-shared-library/133823 "2025-11-24T09:29:26Z")

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I use JuMP.jl with HiGHS.jl to solve an optimisation problem, then generate a shared library for this using JuliaC.jl. The shared library is used within a larger software. It is loaded once (at startup), and then always …

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## [Banded Jacobian of the constraints](https://discourse.julialang.org/t/banded-jacobian-of-the-constraints/133766)

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**Author:** [@Ceserik](https://discourse.julialang.org/u/Ceserik)\
**Replies:** 4\
**Last updated:** [November 10, 2025, 6:22am UTC](https://discourse.julialang.org/t/banded-jacobian-of-the-constraints/133766 "2025-11-10T06:22:04Z")

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Hello, I am using JuMP for solving optimal control of a car on a track. I am trying to reformulate my problem, to improve the sparsity pattern of jacobian of constraints and Hessian of Lagrangian. I have managed to get …

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## [On the relationship between \`JuMP\` and \`MathOptInterface\`](https://discourse.julialang.org/t/on-the-relationship-between-jump-and-mathoptinterface/130329)

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**Author:** [@WuSiren](https://discourse.julialang.org/u/WuSiren)\
**Replies:** 11\
**Last updated:** [July 3, 2025, 6:12pm UTC](https://discourse.julialang.org/t/on-the-relationship-between-jump-and-mathoptinterface/130329 "2025-07-03T18:12:08Z")

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JuMP is essentially a more user-friendly wrapper for MathOptInterface and it can be completely bypassed or replaced by MathOptInterface, right?