Its about a certain form of reinforced learning, called Temporal Difference Learning:

https://inria.hal.science/hal-00840470/document at page 11.

The calculation is called simple because it follows directly from the definitions above. Simple means more like "follows directly from definition without fancy math tricks", not " everyone who can read could solve this in 10 minutes".

I think this is also mostly math related, not physics?

I had a good laugh anyway. Good meme

Same feeling

I work in documentation. We aren't allowed to use words like "simple" or "easy" precisely for this reason.

"We can trivially show that...'

Turns out, after a page of algebra, it wasn't "trivial".

That particular line looks like application of some rule or substitution of a term - on it’s own, simple

This trivial result is left as an exercise to the reader.

We should have never given physicists the alphabet.

"Just a simple chord:"

plays Through Fire & Flames

That's what my son's homework from university looks like. I've done the same stuff about 35 years ago, but as I never used advanced algebra and analysis for my job, I've basically forgotten most of it.

At least I know roughly what my son is talking about. My wife (language teacher of German and English) is completly lost.

My Casio watch calculator has none of those symbols so I don't think it is so simple.

My calc professor would say that stuff and be absolutely giddy despite rows of barely adults with confused faces looking at him.

Math majors: "Duh."

Non-math majors: "And then a miracle occurs..."

Whoever wrote that, could have taught law school with that kind of irony.

(“Brief” my ass.)

I think it says "simple" as due to not discourage the reader, 'cause it's probably a simple substitution in context which just looks complicated at first glance.

Thanks. You just gave me flashbacks to my college classes. I felt a shudder run down my spine

Stochastic differential equations?

To be fair, it looks simple compared to really difficult stuff