The purpose of this invention is to make a special computational tool for studying number theory, teaching mathematics and popularizing science. This slide rule is helpful for proving Goldbach conjecture, verifying chen theorem and other topics connected with the theorem and founding a data base relating to above theory. It is composed of a fundamental rule and a folding rule. On the frontface of the fundamental rule there are an axis of the natural number, an axis of the prime number and/or an axis of the complex prime number. On the back of the folding rule there are an axis of the prime number and/or an axis of the complex prime number but on the front of the folding rule there is an axis of the natural number. |