Intuitionism is a philosophy of mathematics founded by the Dutch mathematician Luitzen Egbertus Jan Brouwer in the early 20th century, asserting that mathematics arises as a free, creative mental activity rooted in the intuition of time and requiring all mathematical objects and proofs to be explicitly constructed by the mind.[1] Central to intuitionism is the view that the truth of a mathematical statement depends on its constructive verification, rejecting abstract existence claims without corresponding mental constructions.