I
In metaethics, a form of cognitivism that holds that moral statements can be known to be true or false immediately through a kind of rational intuition.
In the 17th and 18th centuries, intuitionism was defended by G.E. Moore , and David Ross . Intuitionists have differed over the kinds of moral truths that are amenable to direct apprehension. For example, whereas Moore thought that it is self-evident that certain things are morally valuable, Ross thought that we know immediately that it is our duty to do acts of a certain type.
II
School of mathematical thought introduced by the Dutch mathematician Luitzen Egbertus Jan Brouwer (1881–1966).
In contrast with mathematical {{link=Platonism">Platonism , which holds that mathematical concepts exist independent of any human realization of them, intuitionism holds that only those mathematical concepts that can be demonstrated, or constructed, following a finite number of steps are legitimate. Few mathematicians have been willing to abandon the vast realms of mathematics built with nonconstructive proofs.