I have a few questions on GWC, as the Wikipedia's page on it appears to be somewhat incomplete.

  1. Which of the following two statements is considered as the actual GWC?

    • Every odd number greater than 5 can be expressed as the sum of three primes
    • Every odd number greater than 7 can be expressed as the sum of three odd primes

    The first statement is easily implied from GSC, but the second statement doesn't appear to be so (at least not easily)... So unless I'm overlooking something here, these two statements seem far from being equivalent to each other.

  2. Has it really been proved or only claimed proved by Harald Helfgott?

    • This page on Wikipedia says that it has been proved by Harald Helfgott
    • This page on Wikipedia says that it has been claimed proved by Harald Helfgott



For 2.: actually he says he proved such a result, but I am not aware whether his result was validated. Here two of his works:



However, if $n>4$ even, then GSC implies that exists odd primes $p$ and $q$ such that $n=p+q$. Thus, if $m>7$ odd, then $n=m-3>4$ is even, then $m=p+q+3$.

  • $\begingroup$ Oh, of course, so GSC implies both statements easily (although they are still not equivalent to each other). That doesn't precisely answer question #1, but it does provide the missing information that I was looking for (the semantic of which statement is formally considered as GWC is actually of less interest to me). Thanks. $\endgroup$ – barak manos May 8 '14 at 22:33

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