[grungegun]

Yes, the quantumness of a differential equation is not a property of the differential equation, but a statement about one possible taxonomy of differential equation. Then, whether quantum-type diff eq's have unique properties pertaining to chaos conditioned on our knowledge of them being labelled 'quantum' is an interesting mathematical question.

> Note that there is no Lagrangian for the NS equations, by the way.

I don't know much about fluid dynamics, but I was under the impression that Bennett derives the Lagrangian form in the book Lagrangian Fluid Dynamics

[leephillips]

There is a clash of terminology: the Lagrangian formulation of fluid dynamics follows the path of fluid particles, in contrast to the Eulerian form, which observes the fluid passing by a fixed coordinate system. In general dissipative systems don’t have time-independent Lagrangians.

[grungegun]

yep, that sounds right to me. also I see you're the author of the Noether article from Ars Technica. I enjoyed the read.

[andreareina]

The article presumably being https://arstechnica.com/science/2015/05/the-female-mathemati...

[leephillips]

I’m glad, thanks!

[wrycoder]

Good discussion, thanks!