1. It has occasionally been claimed that it was Frege’s review of this work that made Husserl modify his view (Føllesdal 1958). But others have pointed to Husserl’s own studies of Lotze and Bolzano as being the decisive factor (Mohanty 1977; Bernet, Kern, & Marbach 1993).

2. For an alternative interpretation that considers phenomenology as merely one part of Husserl’s philosophical system, see D. W. Smith 2013.