The purpose of this explication is to highlight the background of post-truth as a viewpoint, namely some of the sources and conditions from which it possible emerged. Based on the controversial philosophical developments in general, and especially those of the philosophy of science of the 20th century, which are continuing to this day, the argumentation will reckon, on the one hand, the viewpoint of verificationism, according to which scientific theories are confirmed if the reference of their prediction is ascertained and scientists have to verify them; as well as, on the other hand, the viewpoint of falsificationism, according to which all scientific theories are false and scientists have to falsify them. The elaboration will be expanded, including the contributions of Thomas Kuhn, Imre Lakatos, Paul Feyerabend, as well as others. The findings of the philosophy of science that the theories of science are false, that theory have an impact on the formation of facts and perceptions, that the dichotomy of facts / values are collapsed, etc., reveal how perhaps the path to post-truth was paved. The explication will be realized through the theoretical approach, the examination of for and coins arguments and analysis to achieve the conclusion that the post-truth as a point of view could emerge as an indirect consequence of developments in philosophy in general and especially in philosophy of science.
Keywords: post-truth, philosophy, philosophy of science, verificationism, falsificationism