Who invented the apoha theory? If you, like me, are prone to answer “Dignāga” and to add that Dignāga (as shown by Hattori) was inspired by Bhartṛhari’s theory and that Dharmakīrti and Dharmottara later fine-tuned Dignāga’s one, you are ready to have your view challenged by K. Kunjunni Raja’s article in Buddhist Logic and Epistemology (ed. by B.K. Matilal and R.D. Evans, 1986, I am grateful to Sudipta Munsi who sent me a copy of it).