It seems like "arbitrary" notation is also a problem in other fields of mathematics such as Linear Algebra - perhaps depending on the background of the author i

It seems like "arbitrary" notation is also a problem in other fields of mathematics such as Linear Algebra - perhaps depending on the background of the author in math or CS. In Linear Algebra every text book has their own favorite notation for matrices, row/column vectors (special letter such as c for column vectors, roman letters, roman letters with an arrow on top) and scalars (greek letters or the letter c).