in Pāṇini's grammar (Mahabhasya) and on Katyayana's aphorisms, as well as according to some, also the author of the Yoga Sutras ), and Pingala ( prosody ). Several debates ranged over centuries, for example, on whether word-meaning mappings were conventional ( Vaisheshika - Nyaya ) or eternal (Katyayana-Patanjali- Mimamsa ). The