Closer to home, forensic evidence may convince us beyond any reasonable doubt that a person died due to a homicide, hence that a killer exists, without any method of finding the killer being provided or
providable. (Maybe the mystery is genuinely unsolvable.) But, Dummett says, such considerations are irrelevant to mathematics; for example, the classicist's point that 'there is no absurdity in thinking of an infinite totality [say of physical objects] as already formed ...