# Lagrange multipliers (duals) in JuMP 0.19

**URL:** <https://discourse.julialang.org/t/lagrange-multipliers-duals-in-jump-0-19/28328>\
**Category:** Optimization (Mathematical)\
**Tags:** question\
**Created:** [September 3, 2019, 2:53pm UTC](https://discourse.julialang.org/t/lagrange-multipliers-duals-in-jump-0-19/28328 "2019-09-03T14:53:21Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![g001234](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/g001234/32/2956_2.png) [@g001234](https://discourse.julialang.org/u/g001234)\
**Post date:** [September 5, 2019, 1:41am UTC](https://discourse.julialang.org/t/lagrange-multipliers-duals-in-jump-0-19/28328/11 "2019-09-05T01:41:01Z")

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I was also confused about this some time ago. I remember the documentation mentioned JuMP is using conic dual, which may be different from the textbook dual. Is the sign difference a result of that?

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