documentation strings for set theory functions #76310
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SUMMARY
The set theory functions are not self-explanatory unless one has taken a course of mathematics or two, hence some documentation is warranted.
Rationale being that I was reading a StackOverflow Answer pertaining to those exact functions and those did link to the code which, without further description is kind of hard to grasp for people not too acquainted with set theory.
For instance the Rust documentation on set functions provides a short description as well as examples, the latter being used as unit tests, which directly conveys to the user what behavior to expect from the invocation.
Documentation was added for:
ISSUE TYPE
COMPONENT NAME
filter/mathstuff