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According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत् शेषवत् सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत् शेषवत् सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धदर्शनं लिङ्गदर्शनं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the relation between the Linga (लिङ्ग । mark) and the Lingi (लिङ्गि । object indicated by the mark) and also between pratyaksha and linga itself. The perception of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana).  

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धदर्शनं लिङ्गदर्शनं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the darshana (perception obtained through the indriyas and manas) of the relation between the Linga (लिङ्ग । mark) and Lingi (लिङ्गि । object indicated by the mark) and also darshana of Linga itself. The darshana (perception) of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana). (Page 26 of Reference<ref name=":6" />)

Thus anumana depends totally on previous experiences through pratyaksha and this knowledge follows other kinds of knowledge. Example : where there is smoke there is fire.   

Thus anumana depends totally on previous experiences through pratyaksha and this knowledge follows other kinds of knowledge. Example : where there is smoke there is fire.   

Tarkasamgraha defines Anumana as   

Tarkasamgraha defines Anumana as  <blockquote>अनुमितिकरणमनुमानम्॥१॥ परामर्शजन्यं ज्ञानमनुमितिः॥२॥ व्याप्तिविशिष्टपक्षधर्मताज्ञानं परामर्शः । <ref>Tarkasamgraha ([https://sa.wikisource.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A5%8D%E0%A4%95%E0%A4%B8%E0%A4%99%E0%A5%8D%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A4%83/%E0%A4%85%E0%A4%A8%E0%A5%81%E0%A4%AE%E0%A4%BE%E0%A4%A8%E0%A4%A8%E0%A4%BF%E0%A4%B0%E0%A5%82%E0%A4%AA%E0%A4%A3%E0%A4%AE%E0%A5%8D Anumana Nirupana])</ref></blockquote>Anumana is of three kinds with each of them having two definitions with elaborately described examples by Vatsyayana for the Nyaya Sutras given by Gautama.

 

अनुमितिकरणमनुमानम्॥१॥ परामर्शजन्यं ज्ञानमनुमितिः॥२॥ व्याप्तिविशिष्टपक्षधर्मताज्ञानं परामर्शः । <ref>Tarkasamgraha ([https://sa.wikisource.org/wiki/%E0%A4%A4%E0%A4%B0%E0%A5%8D%E0%A4%95%E0%A4%B8%E0%A4%99%E0%A5%8D%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9%E0%A4%83/%E0%A4%85%E0%A4%A8%E0%A5%81%E0%A4%AE%E0%A4%BE%E0%A4%A8%E0%A4%A8%E0%A4%BF%E0%A4%B0%E0%A5%82%E0%A4%AA%E0%A4%A3%E0%A4%AE%E0%A5%8D Anumana Nirupana])</ref>

 

Anumana is of three kinds with each of them having two definitions with elaborately described examples by Vatsyayana for the Nyaya Sutras given by Gautama.

=== Purvavat (पूर्ववत्) ===

=== Purvavat (पूर्ववत्) ===