%0 Journal Article %A Vredenduin, P. G. J. %T The logic of negationless mathematics %J Compositio Mathematica %D 1953 %P 204-270 %V 11 %I Kraus Reprint %U http://www.numdam.org/item/CM_1953__11__204_0/ %G en %F CM_1953__11__204_0