Ignoratio elenchi (also known as irrelevant conclusion or irrelevant thesis) is the informal fallacy of presenting an argument that may in itself be valid, but does not address the issue in question. "Ignoratio elenchi" can be roughly translated by "ignorance of refutation", that is, ignorance of what a refutation is; "elenchi" is from the Greek , meaning an argument of disproof or refutation. (Some sources give "by ignorance of the issues" or even "by ignoring the issues" as a translation of ignoratio elenchi.)