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Every even integer can be expressed as the difference of two primes?

there is one conjecture that I do not know what they are called. This is:

Every even number can be always written as the difference between two prime numbers. Could you please help me to know what it is called?

Regards,

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    Do you mean difference of two prime numbers or sum of two prime numbers.2012-11-01
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    Answered in the comments here: http://mathoverflow.net/questions/111196/what-is-the-name-of-a-conjecture2012-11-01

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