You Be the Editor I

Test your mathematical communication skills. Each of the following sentences or phrases has at least one flaw. How would you edit each one to improve its style or syntax?
  1. These results were obtained jointly by Hilbert and myself.
  2. If x > 0, then Euler proved in 1756 that . . .
  3. Since this limit exists, then the series converges.
  4. Obviously, every group G of prime order is simple.
  5. Occurrences were observed in which . . .
  6. It has been noticed that . . .
  7. The best one of those are in the book.
  8. She is one of those who enjoys mathematics.
  9. How is he doing in terms of calculus?
  10. We will learn in the next chapter, how to solve it.
  11. Prove that any complex number is the product . . .
  12. If x > 1 f(x) < 0.
  13. Substituting (3) into (7), the integral becomes π2/9.
  14. There are several methods that are applicable.

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