The Iliad and the Odyssey were both attributed to Homer in ancient times.
Evidence
The Iliad and the Odyssey DTV differ greatly in tone and vocabulary and in certain details of the fictional world they depict.
Conclusion
The Iliad and the Odyssey SP are almost certainly not the work of the same poet.
Evaluate
The argument assumes that DTV → SP two works that differ greatly in tone and vocabulary and in certain details of the fictional world they depict are not the work of the same poet.