解讀如何提高SAT閱讀水平

　　There are many unsolved problems in mathematics. Some prominent outstanding unsolved problems 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 .

　　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 cubic numbers.

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

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