# Linconstr @JuMP0.21

**URL:** <https://discourse.julialang.org/t/linconstr-jump0-21/60537>\
**Category:** General Usage\
**Created:** [May 4, 2021, 5:23pm UTC](https://discourse.julialang.org/t/linconstr-jump0-21/60537 "2021-05-04T17:23:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![marouane](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/marouane/32/16267_2.png) [@marouane](https://discourse.julialang.org/u/marouane)\
**Post date:** [May 4, 2021, 5:23pm UTC](https://discourse.julialang.org/t/linconstr-jump0-21/60537/1 "2021-05-04T17:23:31Z")

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when using `JuMP@0.18` we use `model.linconstr.lb` to get the lower bound but i don’t know how it can happen using `JuMP@0.21` i tried `JuMP.LowerBoundRef(x)` but instead of getting the values of the lower bounds i got `nothing`