Where is the legend/key? I recall my disappointment when as an artist I started studying different maths for use in animation. I would open a book from a unive

Where is the legend/key? I recall my disappointment when as an artist I started studying different maths for use in animation. I would open a book from a university library and expected to find a page with summary of notation used in the book. Maps have this, I would grumble, why not math books?