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Swami Samantabhadra.
There was no other scholar*. He also states that Buddhist texts refer to Jain monks as 'Kshapanaka', and cites two verses from the 'Avadanakalpalata'+ for proof.
And in this way he has indicated that the scholar named 'Kshapanaka' was not a Buddhist monk. There is no doubt that 'Kshapanaka' refers to Jain monks. If these Kshapanaka scholars were indeed in the court of Siddhasena Vikramaditya and were therefore contemporaries of Varahamihira, then their time appears to be around the 6th century AD. Because Varahamihira's existence is found from 505 AD to 587 AD - he chose Shaka Samvat 427 (505 AD) as the Abda Pind for his astrological calculations x
* I am inclined to believe that Sidhasen was no other than Kshapnaka ( a jain sage ) who is traditionally known to the Hindus to have been one of the nine gems that adorned the court of Vikramaditya, (H. M. S. Indian Lojic p. 15.) + These verses are as follows
That which was spoken by the Lord was conveyed by Subhadra. Hearing it, Kshapanaka quickly became filled with hatred and poison. ||9|| If Subhadra knows his omniscience, then he will abandon his faith in Kshapana out of respect for the Shramanas. ||
-A., Jyotishkavadan. ... See the preface of Dr. Satishchandra's Nyayavatar and 'History of Indian Logic', in which you have also quoted this verse from Varahamihira's 'Panchasiddhantika'