Rare Books

A new key to the exact sciences, or, A new and practical theory by which mathematical problems or algebraic equations of almost every description can be solved with accuracy and with greater facility and simplicity than they can be by any other method that has yet been given by any other author : in which are also introduced a variety of useful and interesting problems, that have never before been proposed, and which it is believed cannot be solved by any method or rules except those here laid down