Gerrit Mannoury

On 8 August 1907 he married Elizabeth Maria Berkelbach van der Sprenkel,[2] with whom he had three daughters and a son, Jan Mannoury.

In 1901 he helped to found the scientific bureau of the Social Democratic Workers' Party (SDAP), of which he was secretary until 1906.

The first appearance of the names "formalism" and "intuitionism" in Brouwer's writings, were in a review of Gerrit Mannoury's book Methodologisches und Philosophisches zur Elementar-Mathematik (Methodological and philosophical remarks on elementary mathematics) from 1909.

[6] Two other Dutch scientists he inspired were philosopher and logician Evert W. Beth and psychologist Adriaan de Groot.

He was also inspired by the work of Friedrich Nietzsche, Baruch Spinoza, the French mathematician philosopher of science Henri Poincaré and the English positivism of Bertrand Russell.

[3] Mannoury was a prolific and polymathic writer who published books, articles, reviews, and pamphlets.