20 16 The difficulty in taking the postgraduate entrance examination in mathematics is due to the high demands on the comprehensiveness and flexibility of candidates. According to the relevant information, the topic of the 20 16 postgraduate entrance examination for mathematics is to explore and expand mathematical knowledge in many aspects, which strictly requires candidates to have the comprehensiveness and flexibility of mathematics, so mathematics is more difficult. Mathematics for postgraduate entrance examination requires candidates to have solid basic knowledge and comprehensive application ability on the basis of fully understanding basic concepts, theorems and methods.