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"You could have invented..."

Oh you know there is gonna be maths in this one. (clicks link)

"Here are the terms we will use throughout: a 'memory store' is a function f..."

Yes. Ha ha! Yes!

Were you hoping they would explain what is essentially a rather sophisticated math structure without using any... math?

You can use math AND spend a few lines explaining the non-trivial syntax. It wouldn't be hard to do in this case and since the article is clearly meant for a large audience, it's a mistake from the author to gloss over various relevant definitions.

That's fair. The example OP gave us was the use of the word "function." I'd be very impressed at a (useful) tutorial that never mentioned that word.

What syntax did you consider non-trivial? The summation sign? The transpose superscript? The use of greek letters? (beta, rho here) This is relatively basic notation for linear algebra, which I guess is the prerequisite for the reader.

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