"The bridge between the electron and the other elementary particles is provided by the fine structure constant. ... An expanded form of the constant leads to equations that define the transformation of..."
- Malcolm H. Mac Gregor
"I introduce the subject of fine structure with a mini-calendar of events. ...Winter 1914-15. Sommerfeld computes relativistic orbits for hydrogen-like atoms. Pashcen, aware of these studies, carefully..."
- Abraham Pais
"The theoretical determination of the fine structure constant is certainly the most important of the unsolved problems of modern physics. We believe that any regression to the ideas of classical physic..."
- Wolfgang Pauli