author of the padapatha  of the Rigveda (a word-by-word analysis of the mantra text). Pāṇini's school Pāṇini's extensive analysis of the processes of phonology , morphology and syntax , the Aṣṭadhyāyī , laid down the basis for centuries of commentaries and expositions by following Sanskrit grammarians. Pāṇini's approach was amazingly formal;