SAT阅读素材：unsolved math problems

2013-10-10 17:37:37来源：互联网

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　　下面小编为大家搜集整理了一篇SAT阅读素材：unsolved math problems。SAT阅读考试除了检测考生的词汇量外，还考察考生的理解及判断的综合能力。

　　There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include

　　1. The Goldbach conjecture.

　　2. The Riemann hypothesis.

　　3. The conjecture that there exists a Hadamard matrix for every positive multiple of 4.

　　4. The twin prime conjecture (i.e., the conjecture that there are an infinite number of twin primes).

　　5. Determination of whether NP-problems are actually P-problems.

　　6. The Collatz problem.

　　7. Proof that the 196-algorithm does not terminate when applied to the number 196.

　　8. Proof that 10 is a solitary number.

　　9. Finding a formula for the probability that two elements chosen at random generate the symmetric group .

　　10. Solving the happy end problem for arbitrary .

　　11. Finding an Euler brick whose space diagonal is also an integer.

　　12. Proving which numbers can be represented as a sum of three or four (positive or negative) cubic numbers.

　　13. Lehmer's Mahler measure problem and Lehmer's totient problem on the existence of composite numbers such that , where is the totient function.

　　14. Determining if the Euler-Mascheroni constant is irrational.

　　15. Deriving an analytic form for the square site percolation threshold.

　　16. Determining if any odd perfect numbers exist.

　　The Clay Mathematics Institute (http://www.claymath.org/millennium/) of Cambridge, Massachusetts (CMI) has named seven "Millennium Prize Problems," selected by focusing on important classic questions in mathematics that have resisted solution over the years. A $7 million prize fund has been established for the solution to these problems, with $1 million allocated to each. The problems consist of the Riemann hypothesis, Poincar conjecture, Hodge conjecture, Swinnerton-Dyer Conjecture, solution of the Navier-Stokes equations, formulation of Yang-Mills theory, and determination of whether NP-problems are actually P-problems.

　　In 1900, David Hilbert proposed a list of 23 outstanding problems in mathematics (Hilbert's problems), a number of which have now been solved, but some of which remain open. In 1912, Landau proposed four simply stated problems, now known as Landau's problems, which continue to defy attack even today. One hundred years after Hilbert, Smale (2000) proposed a list of 18 outstanding problems.

　　K. S. Brown, D. Eppstein, S. Finch, and C. Kimberling maintain webpages of unsolved problems in mathematics. Classic texts on unsolved problems in various areas of mathematics are Croft et al. (1991), in geometry, and Guy (2004), in number theory.

　　读完每一篇SAT阅读素材，我们都要针对SAT素材想想这几个问题。大家平时也可以自己搜集整理一些比较好的SAT阅读考试素材，平时多看一些SAT阅读素材，注意培养语感和阅读速度，对于我们大家考取一个SAT阅读高分是很有帮助的。

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