Mystery equation

[logtek164]

Hello,
I am hoping that people here might be able to provide insight into
what context/s this equation might be relevant, particularly the contents of the brackets.

I am aware it is a strange request, related to puzzle solving,
but perhaps someone can help guide me in an interesting direction.

 

[Deleted member 4993]

Hello,
I am hoping that people here might be able to provide insight into
what context/s this equation might be relevant, particularly the contents of the brackets.

I am aware it is a strange request, related to puzzle solving,
but perhaps someone can help guide me in an interesting direction.

View attachment 18414

That is not an equation - because there is "nothing" on the right-hand-side of the equation. That could be part of Maxwell's equations in cylindrical system.

 

[topsquark]

Nope. Not Maxwell with that second r derivative. The [math]\mathcal{E}[/math] suggests something about a circuit but I can't go any further than that.

-Dan