The Epistemological Foundations of Geometry in 19th Century

The aim of the paper is to offer a theory of the development of the epistemic subject in the history of non-Euclidean geometry. Its basic idea is to use Wittgenstein’s picture theory of meaning from the Tractatus as a tool for analysing the meaning of geometric pictures from the works of Lobachevsky, Beltrami, Cayley, and Klein.