Zhang is the typical demonstration of pure perseverance of traditional Chinese mathematicians: knock harder and harder until the truth is finally cracked.

His work is based on the prior half-way proof by 3 other mathematicians “GPY”:

**Gap between Primes**:

Let p1 and p2 be two adjacent primes separated by gaps of 2N:

p1 – p2 = 2 (**twin primes**)

eg. (3, 5), (5, 7)… (11, 13) and the highest twin primes found so far (the pair below: +1 and -1)

p1 – p2 = 4 (**cousin primes**)

eg. (7, 11)

p1 – p2 = 6 (**sexy primes**)

eg. (23, 29)

…

p1 – p2 = 2N

Euclid proved 2,500 years ago there are infinite many primes, but until today nobody knows are these primes bounded by a gap (2N) ?

Zhang, while working as a sandwich delivery man in a Subway shop…

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