→ BLUEBL00D :TRY U=X+Y , V=X-Y 不過弄出發散說 03/11 21:33
→ bjiyxo :mathematica看圖跟計算都確定是發散 03/11 22:50
int_{-infty}^{+infty} int_{-infty}^{+infty} [1-tanh^2(x+y)] dxdy
Does this integral take finite value?
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