我们知道，判断一件事情的句子叫做命题。数学里，一般都谈到命题的四种形式，以及它们的相互关系。四种命题的形式是：原命题：若A成立则B就成立。逆命题：若B成立则A就成立。否命题：若A不成立则B就不成立。逆否命题：若B不成立则A就不成立。原命题和其他三种命题的真假关系? We know that the sentence that determines one thing is called proposition. In mathematics, there are generally four forms of propositions, and their interrelationships. The form of the four propositions is: The original proposition: If A is true, then B is established. Inverse proposition: If B is established, A is established. No Proposition: If A is not established then B does not hold. Inverse proposition: If B does not hold then A does not hold. The original proposition and the other three propositions true and false relations?