 The case of ignoratio elenchi is more problematic. The last available slot in the Nağāt list is called “sterility of the connection” (ʿaqm al-qarīna) and is seemingly not discussed in the preceding analysis. A possibility is to associate it with case (a), namely with the error resulting from failing to recognize an argument as invalid, which would however distort the original Aristotelian meaning. It may be that Avicenna fails (or refuses) to recognize ignoratio elenchi in Aristotle’s sense and perhaps turns into something like the error resulting from a lack of awareness of the form of the syllogism, which leads to accept an invalid argument as valid. This would be consistent with the Išārāt vocabulary, which introduces the “ignorance of the composition” (ǧahl at-taʿlīf) as a fallacy while at the same time failing to mention ignoratio elenchi.