 The founding father of American structuralism, Leonard Bloomfield, wrote a 1927 paper titled "On some rules of Pāṇini".Pāṇini's grammar is the world's first formal system, developed well before the 19th century innovations of Gottlob Frege and the subsequent development of mathematical logic.In designing his grammar, Pāṇini used the method of "auxiliary symbols", in which new affixes are designated to mark syntactic categories and the control of grammatical derivations.