Re: Alternative Goldbach?

In article <9pERe.8605$kn4.4538@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"Norm Dresner" <ndrez@xxxxxxx> wrote:

> What, if anything, is known about the relationship between
> a) Goldbach -- Every even number > 2 can be expressed as the sum of two
> primes
>
> and
>
> b) Alt. G -- Every even number can be expressed as the difference of two
> primes
>
> and
>
> c) Comb Alt. G. -- Every even number can be expressed as the sum or
> difference (or both) of two primes

To the best of my knowledge, nothing [beyond the trivial
a) implies c), and b) implies c)].

--
Gerry Myerson (gerry@xxxxxxxxxxxxxxx) (i -> u for email)
.

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