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Not only metaphysical presuppositions are embedded in different theories of valid cognition, even the theories of false cognition which are technically known as 'Khyativada' (Theories of Error) are formulated after keeping parity with such metaphysical presuppositions e.g. when a rope is perceived as snake, it is described as perceived wrongly and reject our earlier cognition as a false cognition. Now the question what is the factor which constitute falsity of the error ? Is the falsity ascribed to the apprehension itself or to both apprehension and content ? These questions are solved by different systems of Indian Philosophy in different ways after following their presupposition. There lies the controversy among different philosophers regarding the nature of false content.

Not only metaphysical presuppositions are embedded in different theories of valid cognition, even the theories of false cognition which are technically known as 'Khyativada' (Theories of Error) are formulated after keeping parity with such metaphysical presuppositions e.g. when a rope is perceived as snake, it is described as perceived wrongly and reject our earlier cognition as a false cognition. Now the question what is the factor which constitute falsity of the error ? Is the falsity ascribed to the apprehension itself or to both apprehension and content ? These questions are solved by different systems of Bharat's Philosophy in different ways after following their presupposition. There lies the controversy among different philosophers regarding the nature of false content.

There are six principal theories on such issues called Asatkhyativada, Atmakhyativada, Akhyativada, Anyathakhyativoda, Anirvacaniyakhyativada and Satkhyativada.

There are six principal theories on such issues called Asatkhyativada, Atmakhyativada, Akhyativada, Anyathakhyativoda, Anirvacaniyakhyativada and Satkhyativada.

=== Tarkasamgraha ===

=== Tarkasamgraha ===

But knowledge is invalid (अयथार्थः । 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">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 : 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 (अयथार्थः । 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 Bharat's 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">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 : 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" />

== Reference ==

== Reference ==