Begging the Question

clipped from en.wikipedia.org Begging the question in logic, also known as circular reasoning and by the Latin name petitio principii, is an informal fallacy found in many attempts at logical arguments. An argument which begs the question is one in which a premise presupposes the conclusion in some way. Such an argument is valid in the sense in which logicians use that term, yet provides no reason at all to believe its conclusion.