Münchhausen Trilemma

This idea comes from the world of epistemology. It shows the impossibility of proving any truth, even in the fields of logic and mathematics. Whenever somebody asks for further proof on an argument, there are only three places the speaker can fall back on:

(1) the circular argument, in which the proof of some proposition is supported only by that proposition, (2) the regressive argument, where each argument requires further proof (3) the dogmatic argument, which rests on accepted principles which are merely asserted rather than defended.