सिद्धान्तम् ॥ Siddhanta (Theory or Accepted Conclusions)
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Siddhanta (Samskrit : सिद्धान्तम्) called as Theory or Accepted Conclusions is one of the Shodasa Padarthas defined by Gautama maharshi, the knowledge of which leads one to Nihshreyasa according to Nyaya Darshana. These sixteen things or padarthas are basically used for understanding the components seen in the world. Many concepts of things or activities of the world are propounded as siddhantas, like srsti siddhanta (theory about creation), siddhantas in ganita (mathematical theories) etc.
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:A proposition or statement of fact asserted in the form "this is so" is called Theory. This also can be an object of cognition but yet is enunciated separately by itself because it is only when there are a number of different theories, and never otherwise, that the three forms of Debate - Discussion, Disagreement and Arguments.<blockquote>तन्त्राधिकरणाभ्युपगमसंस्थितिः सिद्धान्तः ॥२६॥{अभ्युपगमसिद्धान्तलक्षणम्} सः चतुर्विधः सर्वतन्त्रप्रतितन्त्राधिकरणाभ्युपगमसंस्थित्यर्थान्तरभावात्॥२७॥ {तन्त्रभेदौद्देशसूत्रम्} (Nyay. Sutr. 1.1.27)<ref name=":4">Nyaya Sutras ([https://sa.wikisource.org/wiki/%E0%A4%A8%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%B8%E0%A5%82%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%BE%E0%A4%A3%E0%A4%BF/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%A7/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A4%AD%E0%A4%BE%E0%A4%97%E0%A4%83 Adhyaya 1 Ahnika 1])</ref></blockquote>[https://archive.org/details/NyayaSutrasOfGautamaGanganathaJhaVol1MLBD/page/n94 English Translation]
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== परिचयः॥ Introduction ==
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The word Siddhanta is made up of two words "siddha and "anta"; of these the word siddha denotes all those things with regard to which people have the idea that "this is so and so," and 'this thing has such and such a character.' The word Anta denotes the conviction or opinion that people have with regard to the particular character of those things.
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A proposition or statement of fact asserted in the form "this is so" is called Theory (or Doctrine). This is an "object" of cognition but yet is enunciated separately by itself because it is only when there are a number of different theories, and never otherwise, that the three forms of Debate - Discussion, Disagreement and Arguments become possible.