While some scholars point to Frege 's negative review of the Philosophy of Arithmetic , this did not turn Husserl towards Platonism , because he had already discovered the work of Bernhard Bolzano around 1890\/91 and explicitly mentioned Bolzano , Leibniz and Lotze as inspirations for his newer position . Some scholars question whether Frege 's negative review of the Philosophy of Arithmetic helped turn Husserl towards Platonism , but he had already discovered the work of Bernhard Bolzano independently around 1890\/91 and explicitly mentioned Bernard Bolzano , Gottfried Leibniz and Hermann Lotze as inspirations for his newer position .