w⁡(z)=1π⁢ⅈ⁢∫-∞∞ⅇ-t2⁢ⅆ⁡tt-z=2⁢zπ⁢ⅈ⁢∫0∞ⅇ-t2⁢ⅆ⁡tt2-z2,