German idealism
Neo-Kantianism refers broadly to a revived type of philosophy along the lines of that laid down by Immanuel Kant in the 18th century, or more specifically by Schopenhauer's criticism of the Kantian philosophy in his work "The World as Will and Representation" (1818), as well as by other post-Kantian philosophers such as Jakob Friedrich Fries and Johann Friedrich Herbart. It has some more specific reference in later German philosophy.
Hans Vaihinger
Hans Vaihinger (; September 25, 1852 – December 18, 1933) was a German philosopher, best known as a Kant scholar and for his "Die Philosophie des Als Ob" ("The Philosophy of 'As if'"), published in 1911 although its statement of basic principles had been written more than thirty years earlier.