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Annambhatta in his Tarkasangraha explains, Yatartha jnana is Prama. He clearly defines the difference between Prama and Aprama as follows<blockquote>॥ तद्वति तप्रकारकोऽनुभवो यथार्थः। यथा रजते इदं रजतमिति ज्ञानम्। सैव प्रमेच्युते ॥१९॥॥ (Tark. Samg. 3.19)<ref name=":2">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%97%E0%A5%81%E0%A4%A3%E0%A4%B2%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%A3%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%B0%E0%A4%A3%E0%A4%AE%E0%A5%8D Gunalakshana Prakarana])</ref></blockquote>Summary : Thus Prama is that which pertains to यथार्थानुभवः। definite knowledge of an object which is true presentational in character, just as the knowledge an object of silver as "this is silver". Here the knowledge about the quality of silverness (रजतत्वम्) of the object is ''in toto'' without any distortion to silver.

Annambhatta in his Tarkasangraha explains, Yatartha jnana is Prama. He clearly defines the difference between Prama and Aprama as follows<blockquote>॥ तद्वति तप्रकारकोऽनुभवो यथार्थः। यथा रजते इदं रजतमिति ज्ञानम्। सैव प्रमेच्युते ॥१९॥॥ (Tark. Samg. 3.19)<ref name=":2">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%97%E0%A5%81%E0%A4%A3%E0%A4%B2%E0%A4%95%E0%A5%8D%E0%A4%B7%E0%A4%A3%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%B0%E0%A4%A3%E0%A4%AE%E0%A5%8D Gunalakshana Prakarana])</ref></blockquote>Summary : Thus Prama is that which pertains to यथार्थानुभवः। definite knowledge of an object which is true presentational in character, just as the knowledge an object of silver as "this is silver". Here the knowledge about the quality of silverness (रजतत्वम्) of the object is ''in toto'' without any distortion to silver.

But knowledge is invalid (अयथार्थ । ayatartha) when a character not possessed by the object of cognition is attributed to that object and is called Aprama.<ref name=":3">Harh, Amal Kumar. (1994) Ph. D Thesis Title : The Means of knowing a negative fact a critical study on the theory of Anupalabdhi in Indian philosophy. [http://shodhganga.inflibnet.ac.in/bitstream/10603/137453/7/07_chapter_02.pdf (Chapter 2)] University of North Bengal</ref><blockquote>तदभाववति तत्प्रकारकोऽनुभवोऽयथार्थः। यथा शुक्ताविदं रजतमिति। सैव अप्रमा इत्युच्यते॥२०॥ (Tark. Samg. 3.20)<ref name=":2" /></blockquote>Summary : When a piece of shell is called "this is silver", then the cognition is invalid. For in this case "silverness" is a quality which does not belong to the shell but is being attributed to it is called Aprama.<ref name=":3" />

But knowledge is invalid (अयथार्थ । ayatartha) when a character not possessed by the object of cognition is attributed to that object and is called Aprama.<ref name=":3">Harh, Amal Kumar. (1994) Ph. D Thesis Title : The Means of knowing a negative fact a critical study on the theory of Anupalabdhi in Indian philosophy. [http://shodhganga.inflibnet.ac.in/bitstream/10603/137453/7/07_chapter_02.pdf (Chapter 2)] University of North Bengal</ref><blockquote>तदभाववति तत्प्रकारकोऽनुभवोऽयथार्थः। यथा शुक्ताविदं रजतमिति। सैव अप्रमा इत्युच्यते॥२०॥ (Tark. Samg. 3.20)<ref name=":2" /></blockquote>Summary : When a piece of shell is called "this is silver", then the cognition is invalid. For in this case "silverness" is a quality which does not belong to the shell but is being attributed to it is called [[Aprama (अप्रमा)|Aprama]].<ref name=":3" />

Thus Prama has two aspects  

Thus Prama has two aspects