假言推理规则(外国英语资料).docVIP

假言推理规则 Yes and yes, no are contradictory; All non and yes are a pair of contradictory relations; There is a contradiction between yes and no The definition of a subject, hypothetical reasoning rules The complex proposition occupies a certain proportion in the national civil service exam for test, and the hypothetical proposition as a key complex proposition, it has a high value, easy to grasp, candidates need to master the knowledge points. On the form of a hypothetical proposition, hypothetical reasoning rules are easy to learn and master the Hebei civil service examination network conducted brief introduction. What is the hypothetical derived topic? What is given some hypothetical proposition, and ask so what can be concluded, which can launch what? This kind of problem, is hypothetical derived problems for this kind of problems, we need to do is in the title of the hypothetical proposition into the form of A--B, then we use inference rules of a hypothetical proposition (hypothetical proposition and its inverse proposition is equivalent) and false proposition of the chain of reasoning (if there is A--B, B--C, then A--C) to determine the options. Analytical exercises and answers two questions, hypothetical reasoning rules 1, a is a necessary condition for B, and C is a sufficient condition for B, but not a necessary condition for b.: A, C is a sufficient condition for a, not a necessary condition for a. B, C is a necessary condition for a single, not a sufficient condition C and C are necessary and sufficient conditions for a D and C are neither the sufficient condition nor the necessary condition of a Answer: A Analysis: this problem is a typical type of hypothetical reasoning rules, then we found the inference relation contained in the question is: C / B / A, then the four option is to ask us a and C. We find that C can introduce a, then C is a sufficient condition of a, and a can not launch C, because the inverse proposition is not to determine the true and fal