Four commentaries on Siva Sutras are available at present, the Vimarsini commentary of Ksemaraja in prose, the Siva-sutra-vrtti by some anonymous author in prose, the Siva-sutra-varttikam by Varadaraja in verse.
The Siva-Sutra-vrtti is so close to Vimarsini that it appears to be either a preliminary draft or a later abstract of the Vimarsini. There is a strong presumption that the author of the Vrtti was Ksemaraja himself.
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