∫0∞f⁡(x)⁢g⁡(y⁢x)⁢ⅆ⁡x=12⁢π⁢ⅈ⁢∫σ-ⅈ⁢∞σ+ⅈ⁢∞y-s⁢ℳ⁡(f;1-s)⁢ℳ⁡(g;s)⁢ⅆ⁡s,