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106
It is established that the philosophical validity of Siddhasena's work is not less than that of "Sarvarthasiddhi" and "Rajavartika." Despite differences in methodology, both works discuss logic, Nyaya, Vaisheshika, Samkhya, and Buddhist philosophy as legacies within Siddhasena's work; moreover, Siddhasena firmly establishes the earlier tradition akin to Jinabhadra Ganikshamashramana through philosophical and logical discourse, and this foundational study is prominently evident in his work. Observing Siddhasena's writings reveals that by his time, many commentaries on Tattvartha had already been composed. In several instances, while interpreting a single aphorism, he incorporates five to six perspectives. This leads to the inference that Siddhasena must have encountered at least five existing commentaries on Tattvartha when composing his own, which seem distinct from the well-known Digambara commentaries such as "Sarvarthasiddhi," because it is quite likely that Siddhasena's work was composed before "Rajavartika" and "Vartik." There is a notable difference between the timing of their compositions, as Siddhasena had no occasion to become acquainted with "Rajavartika" and "Shlokavartika." The creation of "Sarvarthasiddhi" was certainly prior, but during Siddhasena's time, it was definitely known, though the divergences in geographical contexts are also considerable.