The matrix mechanics of Werner Heisenberg (1925) makes no mention of wave functions or similar concepts but was shown to be mathematically equivalent to Schrödinger's theory.
Mekanika e matricave e Uerner Hajzenbergut (1925) nuk e përmend fare konceptin e funksionit valor ose koncepte të ngjashme, e megjithatë ajo u tregua se ishte komplet ekuivalente me teorinë e Shrodingerit.