A discussion on the electromagnetic mass of electrons

The issue of the electromagnetic mass of electrons remains an unresolved problem in physics. Traditionally, it has been believed that the electromagnetic mass of electrons naturally constitutes a part of their rest mass (i.e., ). In recent years, a new and opposing viewpoint has emerged, suggesting that the electromagnetic mass of electrons is not a component of their rest mass. This perspective has now garnered substantial support from both theoretical and experimental evidence. Undoubtedly, the exploration of the electromagnetic mass of electrons inevitably touches upon many aspects of physics, such as electron spin. Therefore, while explaining the new viewpoint, necessary clarifications and discussions on these related topics are also provided.