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He is also mentioned by the great Digambarächarya Prabhachandra in his Nyayakumudachandra a commentary on the Laghiyastraya of Akalankadeva. Pandit. Mahendrakumar the learned editor of the NKC. puts Prabhachandra between 950-1020 A. D. and Anantavirya in the ninth century A.D.18.
As to Vidyanandin we find that he mentions Dharmottara, Prajñākara and Mandanamisra and quotes Karikas from the Vārtika on Bṛhadaranyaka of Suresvara. The first two are put in the eighth century of the Christian Era; Mandanamisra is later than Kumarila, and Suresvara being a desciple of Sankaracharya later than S. Mr. P. V. Kane puts Suresvara in between 800-840. Pandit Mahendrakumar following this order puts Vidyanandin also in the ninth century. Dr. Satishchandra puts him about 800 A. D. 19 Pandit Vamsidhara the editor of Astashasri puts Vidyanandin in the middle of the ninth century of the Vikrama Era-that is to say about 796 A. D.
From the consideration of the dates of Anantavirya and Vidyanandin we are inclined to believe that TPS and its author Jayaraşi are earlier than the ninth century of the Christian Era.
In order to find out the earlier limit of the age of TPS we have to rely upon the references to other works and their authors as well as to other Darsanas in it. The main theme of TPS is the examination of the Instruments of Valid Knowledge and so with that aim it surveys the entire field of the then known schools of Indian Philosophy. It mentions Sankhyas (P. 79), Mimāṁsakas (23, 58, 82), Kanadas, i. e. Vaiseşikas (P. 117), Naiyāyikas (pp. 6, 12, 14, etc.), Bauddhas under various names (pp. 27, 35, 41, 42, 45, 56, 79, 81, 83 etc.) and the Digambaras of the Jain Sect. It also refers to the आनन्दरूपमात्मनः कैवल्यम् (P. 81 ) which seems to be a Vedanta view older than that of Sankaracharya and refers also to the Sambhava and Aitihya Pramaņas, subsuming the former under Anumana and the latter under Agama (p. 113). The last section of the work is devoted to साधुपदाद् अर्थप्रतिपत्ति doctrine of the Vaiyakaranas especially that of Bhartṛhari.
Thus it becomes clear that TPS is familiar with the philosophical views of almost all important schools-Vedic,
18. Dr. Satishchandra Vidyabhushana in his His. of Indian Logic puts Prabhachandra about 825 A. D. (p. 193) while curiously enough puts Anantavirya about 1039 A. D. (p. 198).
19. H. 1. L. pp. 186-87