 By the late nineteenth century, in Austria as well as Germany, algebraic logic had found a central place in the raging controversies over the relationship between science and philosophy and, in particular, between mathematics, logic and psychology. Neurath and Olga Hahn became acquainted with algebraic logic at the University of Vienna sometime around 1902-3, but it wasn’t until 1909, after Olga had become blind and Neurath was back in Vienna providing assistance, that she started working on algebraic logic for her doctorate in philosophy. In 1909 Wilhelm Wundt had published a third volume of his Logik; in 1909, part 1 of Schröder’s synthetic treatment, Abriss der Algebra der Logik appeared posthumously; and in 1910 part 2 was published, as well as Olha Hahn’s thesis director Adolph Stöhr’s Lehrbuch der Logik in Psychologisiender Darstellung (see Cat 2019 for details and references).