What is "kathavatthu"

Kathāvatthu ( Pāli) (abbrev. Kv, Kvu), translated as "Points of Controversy", is a Buddhist scripture, one of the seven books in the Theravada Abhidhamma Pitaka. The text contrasts the orthodox Theravada position on a range of issues to the heterodox views of various interlocutors; the latter are not identified in the primary source text, but were speculatively identified with specific schools of thought in the (historically subsequent) commentaries. The original text is putatively dated to coincide with the reign of King Ashoka, but this, too, is debatable.

Translation: Points of Controversy, tr. S.Z. Aung & C.A.F. Rhys Davids (1915, 1993), Pali Text Society1, Bristol.