The location of event horizon and surface gravity near event horizon of Kerr black hole are given directly by Dirac equation htrough generalized Tortoise translation.

• 从 Dirac方程出发 ,经广义 Tortoise坐标变换后 ,在视界曲面附近求解 ,直接导出Kerr黑洞的视界位置及视界表面重力 ,证明了 Kerr黑洞的视界是球对称的