A fringe theory is an idea or a viewpoint that differs significantly from the accepted scholarship of the time within its field. Fringe theories include the models and proposals of fringe science, as well as similar ideas in other areas of scholarship, such as the humanities. In a narrower sense, the term fringe theory is commonly used as a pejorative, roughly synonymous with the term pseudo-scholarship. Precise definitions that make distinctions between widely held viewpoints, fringe theories, and pseudo-scholarship are difficult to construct because of the demarcation problem. Issues of false balance or false equivalence can occur when fringe theories are presented as being equal to widely accepted theories.