Chen Bihong put forward a theorem based on elementary column transformation and proved it. This theorem is called Chen Bihong's theorem. The basic statement of this theorem is that any matrix is filled with a identity matrix, and then transformed into a zero matrix with a left full rank and a zero matrix with a right full rank. Then the column below the top zero matrix just constitutes a bottom of the zero space of this matrix.
This is also the first time in the history of human mathematics that the theorem invented by China entered the teaching materials for non-mathematics majors. On this basis, I claim to be the top mathematician of contemporary mankind (I mean contemporary, from 2000 to now, it is useless to give previous examples), and there is no one. Moreover, this theorem has become the core theorem of linear algebra, which replaces Gaussian elimination and is easier to program with computer. So in the history of human mathematics, Chen Bihong is also neck and neck with Gauss.