课程名称︰分析导论上 课程性质︰必修 课程教师︰王蔼农 开课学院：理学院 开课系所︰数学系 考试日期（年月日）︰2016/11/10 考试时限（分钟）：110分钟 试题 : 1. For every rational numberp, p^2<3, can you find another rational number q, q>p, q^2<3? If yes, express q in terms of p. q=q(p)=? 2. Suppose a,b属於R^2 find c属於R^2 and r>0 so that 2|x-a|=3|x-b| if and only if |x-c|=r 3.Can you find a one-to-one and onto map f from the set of natural numbers N={1,2,3,...} to the set of all its subsets. If yes, f(n)=? 4. is sqrt(2)+sqrt(3)an algebraic number or a transcendental number? 5. Let (X,d(x,y)) be a metric space. Define g(x,y)=arctan(d(x,y)). Is(X,g(x,y)) a matric space too? 6.In the field C of complex numbers, define a+bi>c+di if a>c, or if a=c and b>d Is (C,>) an ordered field? 7. If we do not assume a Dedekind cut to have no maximal element, then a Dedekind cut may or may not have a maximal element. In thi ordered field slightly larger than R, find the additive identity element 8.In the topological space R of real numbers, define an equivalence relarion by x~y if x-y is an integer. Denote by R/~ the set of equivalence classes with the quotient topology. Is R/~ a compact topological space? 9.Generalized Cantor Set C is obtained by first removing the middle 1/4 from the interval [0,1] so the remaining set is [0,3/8]U[5/8,1]. Then remove sub-intervals of length 1/4^2 from the middle of each of the two remaining intervals.Continuing indefinitely with this removal. C is the set of points that one never removed.Find its length and dimension 10.Find a function f(x) which is continuous at rational points and discontinuous at irrational points. Find a function g(x) which is continuous at irrational points and discontinuous at rational points. --

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