Werner Heisenberg , Paul Dirac and Lise Meitner were there .
沃纳·海森堡、保罗·迪拉克和莉泽·迈特纳也在场。
It was in1931 that Paul Adrien Maurice Dirac firstly put forward and also theoretically demonstrated the existence of magnetic monopole .
1931年P·狄拉克首先提出存在磁单极子,并且从理论上予以论证。