TY - BOOK AU - Troelstra A S TI - Principles of Intuitionism U1 - 511.22 PY - 1969/// CY - Berlin PB - Springer-Verlag KW - Arithmetics KW - Intuitive mathematics N1 - Lectures Presented at the Summer Conference on Intuitionsm and Proof theory 1968 at Suny at Buffalo,N.Y ER -