Goldbach Theorem 5 [' S# ~1 p* p- N- A# t Union of set construction and analysis ; {* Q2 Y; G# T. d# z" s 9 j3 N' i; U# ^" ~ y& F' T Loudi Xiaoguang mathematical research studio Su Xiaoguang . @, c7 L9 S9 R2 Q Abstract: In the analytic number theory Goldbach problem is an important issue. The authors studied the:A={N │ N = (N-i) + i, N is a natural number, i belong to N} Clearly A is a countable set。C={N │ N = Pi + Pj, N is even number, Pi, Pj is prime number,i, j is natural number} Clearly, C is A subset。So C is a countable set.If x ={x|x no less than 6 and not more than N is an even number,x=P1+P2, P1, P2 is prime number},card (x)=M (x).Clearly, x is C subset。So x is a countable set.We can get the M(x) range,If N ={N|N = P1 + P2, N is even number, P1, P2 is prime number},card (N)=D(N),D(N)=M(N)-M(N-2)# F+ @0 b( r) Z E& b: P+ |
So when N> 800000 when, D(N)No less than1.8432(1-1/logN)N/log^2_(N-2);I/ x" X1 p* @8 E
Not more than5.0176[1+2/logN +o(1)]N/log[(N-2)/2]log(N-2)。7 b2 D6 I1 D z. U; y) s; S
Key words: Germany,Goldbach,Union of set,even number, prime number, ) O9 j) z9 b7 s+ ?4 f& PMR (2000) theme classification: 11 P32 : N3 G' U# `! z/ y M7 IEmail:suxiaoguong@foxmail. Com