In this section, the authors, Prof. Max Born and KAR CHIA CHENG, present a theory of superconductivity based on the interaction of electrons with the ionic lattice, particularly near the corners of Brillouin zones. They propose that a metal can be superconductive if a set of corners of a Brillouin zone lies very close to the Fermi surface. This theory explains why superconductive elements are found exclusively in two columns of the periodic table, marked by rectangular blocks on either side of the transition metals. The authors also deduce that alloys formed from elements on opposite sides of these superconductive columns are more likely to be superconductive due to the complementary filling of Brillouin zones. For example, alloys like BiAu and CuS, which are formed from elements from different sides of the superconductive columns, exhibit superconductivity.In this section, the authors, Prof. Max Born and KAR CHIA CHENG, present a theory of superconductivity based on the interaction of electrons with the ionic lattice, particularly near the corners of Brillouin zones. They propose that a metal can be superconductive if a set of corners of a Brillouin zone lies very close to the Fermi surface. This theory explains why superconductive elements are found exclusively in two columns of the periodic table, marked by rectangular blocks on either side of the transition metals. The authors also deduce that alloys formed from elements on opposite sides of these superconductive columns are more likely to be superconductive due to the complementary filling of Brillouin zones. For example, alloys like BiAu and CuS, which are formed from elements from different sides of the superconductive columns, exhibit superconductivity.