# Derivative term in only one direction

**URL:** <https://fenicsproject.discourse.group/t/derivative-term-in-only-one-direction/6217>\
**Category:** variational formulation\
**Created:** [July 11, 2021, 10:26am UTC](https://fenicsproject.discourse.group/t/derivative-term-in-only-one-direction/6217 "2021-07-11T10:26:38Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![bleyerj](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/bleyerj/32/6020_2.png) [@bleyerj](https://fenicsproject.discourse.group/u/bleyerj)\
**Post date:** [July 12, 2021, 2:51pm UTC](https://fenicsproject.discourse.group/t/derivative-term-in-only-one-direction/6217/4 "2021-07-12T14:51:33Z")

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Hi,  
`u.dx(0)` is \partial u /\partial x and `u.dx(1)` is \partial u / \partial y.

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