# Evolution equation without x

**URL:** <https://community.freefem.org/t/evolution-equation-without-x/1156>\
**Category:** General Discussion\
**Created:** [August 15, 2021, 9:36am UTC](https://community.freefem.org/t/evolution-equation-without-x/1156 "2021-08-15T09:36:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Aicha](https://avatars.discourse-cdn.com/v4/letter/a/ec9cab/32.png) [@Aicha](https://community.freefem.org/u/Aicha)\
**Post date:** [August 15, 2021, 9:36am UTC](https://community.freefem.org/t/evolution-equation-without-x/1156/1 "2021-08-15T09:36:57Z")

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Hi,

is it possible to resolve with FF++ equation depending only on time t and not depending on x. For example, what’s formulation we have to use to find u(t) solution of the equation

du/dt =a\*u

?

Regards