Containment is specified from src to dst where the source has a containment attribute quantity, meaning that quantity objects of type src can be contained in an object of type dst. Pointers are specified as a one to one mapping from source to destination, using the name of the pointer. ...
it’s easier to know what it is than to memorize and apply the formula. The chain rule is just how to take the derivative of “chained” functions — meaning, function x() calls function g(), and you want the derivative of x(g())....