 The law does not allow evidence to be adduced to prove facts that are immaterial. Whether evidence may be adduced to prove a material fact may depend on whether the material fact is disputed; for instance, the requirement that it must be disputed exists under Rule 210 of the Evidence Code of California but not Rule 401 of the Federal Rules of Evidence in the United States. “Relevance” is often used in the broader sense that encompasses the concepts under discussion. Evidence is sometimes described as “irrelevant” not for the reason that no logical inference can be drawn to the proposition that is sought to be proved (in our example, A is strictly speaking relevant to B) but because that proposition is not material or not disputed (in our example, B is not  material).[10]  This broader usage of the term “relevance”, though otherwise quite harmless, does not promote conceptual clarity because it runs together different concepts (see James 1941: 690–691; Trautman 1952: 386; Montrose 1954: 537).