Leibniz invented binary system and assumed a "universal characteristic", a symbol system that contained all the human thoughts; the" mechanical reasoner "that he invented contains the ideas, namely reasoning is a deduction system based on formal rule. 莱布尼茨发明了二进制表示方法,设想了一种普遍文字,能包含人类全部思想的符号系统;他所提出的机械推理机包含这样的思想,即推理是一个根据形式规则进行的演绎系统。