Solipsism and philosophy of mathematics: intuitionists compared

This paper will consider L.E.J. Brouwer, A. Heyting and G.F.C. Griss as the first generation of Dutch intuitionists to look at the interrelationship between solipsism and mathematics. In particular our focus will be on Heyting, on the basis of the existence of some unpublished material (and also some published material difficult to find) revealing of the author's opinion on the subject and hence worthy of attention.