Notation is highly variable in math. Take a look at penrose notation [1] as example of just how different they can be. Most mathematics books will have a defini

Notation is highly variable in math. Take a look at penrose notation [1] as example of just how different they can be. Most mathematics books will have a definition section in the front stating their notation choices because things are so fragmented. Good luck trying to read something like Russell's PM without a notation guide open alongside it. [1] https://en.wikipedia.org/wiki/Penrose_graphical_notation https://en.wikipedia.org/wiki/Penrose_graphical_notation