Complete Documentation of Appian Expression Language?

I have been unable to find a starting point to the COMPLETE documentation of the Appian expression language (I don't know the correct name as I have not been able to find one).

As an example, I found this by searching Google:

https://docs.appian.com/suite/help/23.3/expression-advanced-evaluation.html

But, this seems to be a random orphan page. I am unable to find a series of pages to which this belongs, and if I start from the menu on the upper left, I don't see how one would encounter this page by navigating that menu.

I have found the page with documentation to all the functions, but not a complete FULL documentation to the syntax of the expression language. I would absolutely love to read it in its entirety instead of having vague ideas of what can be done and how it works from random examples.

Where can I find this documentation that I seek? Am I overlooking something obvious?

Thank you

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