Goldbach Theorem 3 X7 `8 N, `4 k Union of set construction and analysis4 D; p/ b: P# r$ Z
& ~2 L z/ v' R( j: g: l% c" Q0 O Loudi Xiaoguang mathematical research studio Su Xiaoguang , D0 N8 J# t8 g" m* I" m; C 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) # C' m: c! y) b' t2 [# {" KSo when N> 800000 when, D(N)No less than1.8432(1-1/logN)N/log^2_(N-2);I0 k; \2 C, }8 L0 r. U' \4 R# \# w) @3 j
Not more than5.0176[1+2/logN +o(1)]N/log[(N-2)/2]log(N-2)。) V+ j+ q0 D/ N- Y
Key words: Germany,Goldbach,Union of set,even number, prime number, ' O5 P- q9 M- T- _+ PMR (2000) theme classification: 11 P32 2 c1 n: t: Z+ y2 C( t4 p2 N* a
Email:suxiaoguong@foxmail. Com