“Next we have the Vārttikas or "Notes" of Kātyāyana (probably third century B. C.) on 1245 of Pāṇini's rules, and, somewhat later, numerous grammatical Kārikās or comments in metrical form: all this critical work was collected by Patanjali in his Mahābhāshya or "Great Commentary," with supplementary comments of his own. He deals with 1713 rules of Pāṇini.”
Appendix A History of Sanskrit Literature
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Pāṇini 37
ancient Sanskrit grammarianRelated quotes
An Analytical Study of 'Sanskrit' and 'Panini' as Foundation of Speech Communication in India and the World
There are also two appendixes to which Pāṇini refers: one is the Dhātupāṭha, "List of Verbal Roots," containing some 2000 roots, of which only about 800 have been found in Sanskrit literature, and from which about fifty Vedic verbs are omitted; the second is the Gaṇapāṭha, or "List of Word-Groups," to which certain rules apply. These gaṇas were metrically arranged in the Gaṇaratna-mahodadhi, composed by Vardhamāna in 1140 A.D.
Appendix A History of Sanskrit Literature
cf. Taittiriya Upanishad 1.11
An Analytical Study of 'Sanskrit' and 'Panini' as Foundation of Speech Communication in India and the World
An Analytical Study of 'Sanskrit' and 'Panini' as Foundation of Speech Communication in India and the World

1819
Source: History of Mathematics (1925) Vol.2, Ch. 6: Algebra
“Collection of Eight Chapters”
Prof. George Cardona in: Indo-Aryan languages http://www.britannica.com/EBchecked/topic/286348/Indo-Aryan-languages/74594/Characteristics-of-Old-Indo-Aryan-texts#ref603388, britannica.com., 20 January 2014.