George F. C. Griss
George François Cornelis Griss (30 January 1898, Amsterdam – 2 August 1953, Blaricum), usually cited as G. F. C. Griss, was a Dutch mathematician and philosopher, who was occupied with Hegelian idealism and Brouwers intuitionism and stated a negationless mathematics. Griss was a student of L. E. J. Brouwer and formulated an intuitionism based on a Hegelian idealism.