发布网友 发布时间:2024-08-20 13:59
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热心网友 时间:2024-09-04 08:27
设 I= 泊松积分 = (0, ∝ )∫[e^(-x^2)] dx I^2 = {(0, ∝ )∫[e^(x^2)] dx }*{(0, ∝ )∫[e^(y^2)] dy= (积分区间D )∫∫[e^(-x^2 - y^2 )] dxdy (面积分)=> [ 积分变换 ρ^2 = x^2 + y^2 , dxdy = ρdρdθ , D: 0 ≤ρ≤ + ∝ , 0 ≤θ≤ π/2 ]= (积分区间D )∫∫[e^(-ρ^2) ] ρdρdθ (面积分)= {(0 ≤θ≤ π/2 )∫dθ}{(0 ≤ρ≤ + ∝ )∫[e^(-ρ^2)ρdρ ] }= (π/2)* (1/2)故 I = 泊松积分 = (√π)/2