“The authors, breaking with the intuitionism that had dominated eighteenth-century French treatises, updated the logic of geometry manuals.”

“This theory of intuitionism influenced later philosophers, in particular Rousseau and Bergson, but also the existentialists.”

“They both fail for open set logic, which is to say intuitionism, just as they both fail for its topological dual, closed set logic.”

“He was an intuitionist who stressed the essential role of human intuition in the foundations of mathematics.”

“The hard-headed finitist has to restrict logic even further than the intuitionist does.”

“He is an epistemological realist, an ethical intuitionist, and a political libertarian, too extreme for my tastes but always provocative.”