An argument from ignorance (), or appeal to ignorance ('ignorance' stands for "lack of evidence to the contrary"), is a fallacy in informal logic. It says something is true because it has not yet been proved false. Or, that something is false if it has not yet been proved true. This is also called a negative proof fallacy. This also includes the (false) assumption there are only two options (true or false). There may be as many as four choices: