Hari Om,
One fascinating discussion in Advaita Siddhi, in ajnAna-pratyaksha-vichArah, is presented as per my understanding below. Learned members may share their views on the correctness of my understanding.
Objection: You accept that ajnAna-pratyaksha is vishishTa-vaishishTya-vishayaka. Because ajnAna-pratyaksha is always qualified with jnAna-virOdhitva and sa-vishayakatva. Without qualified with vishaya or without qualified with jnAna-virOdhitva, there is no perception of ajnAna. ajnAna-qualified-with-these-two-visheshaNa appears in Atman. Therefore, ज्ञानविरोधित्व-सविषयकत्व-विशिष्ट-अज्ञान-विशिष्ट-आत्मन: प्रत्यक्षम् एव अज्ञानस्य प्रत्यक्षम्। Therefore, विशिष्टस्य-अज्ञानस्य वैशिष्ट्यम् आत्मनि भासते। अतो अज्ञानस्य प्रत्यक्षं विशिष्ट-वैशिष्ट्य-विषयकमेव। In ajnAna-pratIti, AtmA is the visheshya and ajnAna is the visheshaNa. Thus, ajnAna has visheshaNatA. The visheshNatA-avachchhedaka are jnAna-virOdhitva and sa-vishayakatva. Thus, before vishishTa-vaishishTya-avaghAhi-jnAna i.e. ajnAna-pratyaksha, you need to have visheshaNatA-avachchhedaka-prakAraka-jnAna. And thus, the contradiction would remain because the vishaya-jnAna will lead to cessation of ajnAna.
Answer: There is no pramANa that visheshaNatA-avachchhedaka-prakAraka-jnAna has kAraNatA towards vishishTa-vaishishTya-avagAhi-jnAna.
Let us understand the theory. When we say दण्डी पुरुषः, here purusha is visheshya and danDa is visheshaNa. This दण्डी पुरुषः is vishishTa-vaishishTya-avagAhi-jnAna.
The danDa has, therefore, visheshaNatA. And the visheshaNatA-avachchhedaka is danDatva.
Now, danDatva-vishishTa-danDa-jnAna is called visheshaNatA-avachchhedaka-prakAraka-jnAna.
The claim of the opponent is that without such visheshaNatA-avachchhedaka-prakAraka-jnAna, there cannot arise vishishTa-vaishishTya-avagAhi-jnAna i.e. “danDI purushah”. Because, first we know danDatva-vishishTa-danDa and then only danDa-vishishTa-purusha-jnAna can arise.
Similarly, like दण्डी पुरुषः, we have अहम् अज्ञः। Here, AtmA is akin to purusha and ajnAna is like danDa. And like danDatva, there are savishayakatva and jnAna-virOdhitva. Therefore, before the knowledge अहम् अज्ञः, we need to determine savishayakatva and jnAna-virOdhitva. And ajnAna-vishaya having been known, there would no longer remain ajnAna. Thus, contradiction remains in bhAvarUpa-ajnAna paksha, so claims pUrvapakshI.
SiddhAntI explains - This very idea that there is a vishishTa-vAishishTya-avagAhi-jnAna being kArya and there is a preceding visheshaNatA-avachchhedaka-prakAraka-jnAna as kAraNa is untenable as there is no pramANa therefor.
Let the knowledge “दण्डी पुरुषः” be kArya, fine, but the kAryatA-avachchhedaka is simply pratyaksha-tva and not vishishTa-vAishishTya-avagAhi-jnAna-tva. And the kAraNatA-avachchhedaka is not visheshaNatA-avachchhedaka-prakAraka-jnAna-tva, rather indriya-sannikrishTa-tva. When such a simple already accepted (क्लृप्त) kArya-kAraNa-bhAva is available, what is the need to accept a new kAryatA-avachchhedaka and kAraNatA-avachchhedaka.
Similarly, in case of वह्निमान् पर्वतः, the kAryatA-avachchhedaka is anumiti-tva and not vishishTa-vAishishTya-avagAhi-jnAna-tva. Similarly, kAraNatA-avachchhedaka is vyApti-jnAna-tva and not visheshaNatA-avachchhedaka-prakAraka-jnAna-tva.
Similarly, for upamiti-jnAna and shAbda-jnAna.
The crux of the matter is - the kArya-kAraNa-bhAva can be explained by क्लृप्त-कार्य-कारण-भाव only and there is no need to imagine new avachchhedakAs for kAryatA and kAraNatA.
Objection: If we accept different kAryatA-avachchhedaka and kAraNatA-avachchhedaka for the four jnAna such as pratyaksha-jnAna, anumiti-jnAna, upamiti-jnAna and shAbda-jnAna, then how can we justify the definite feeling of vishishTa-vAishishTya-avagAhi-jnAna-tva?
Answer: See, blue-rUpa originates from different material, pot originates from different material. Thus, the kAryatA-avachchhedaka of blue-rUpa and pot are blue-ness and pot-ness respectively. Yet, when they combine, then their combined form is enough to give rise to a specific buddhi, namely नीलघटत्व, blue-pot-ness. There is no need to search for a different kAryatA-avachchhedaka. The combined form of separate kAryatA-avachchhedaka is enough to give rise to singular buddhi. Similarly, दण्डी पुरुषः has pratyakshatva as kAryatA-avachchhedaka, वह्निमान् पर्वतःhas anumititva as kAryatA-avachchhedaka. But, seen together, they appear to have vishishTa-vaishishTya-avagAhi-jnAna-tva. There is no need to say that vishishTa-vaishishTya-avagAhi-jnAna-tva is separate kAryatA-avachchhedaka. It just arises like blue-pot-ness on account of the combination of pratyakshatva and anumititva. Advaita Siddhi, p. 1137, says - विशिष्टवैशिष्ट्यबुद्धित्वेन विशेषणतावच्छेदकप्रकारकज्ञानत्वेन च कार्यकारणभावे मानाभावात् , प्रत्यक्षत्वादिरूपेण पृथक् पृथक् क्लृप्तकार्यकारणभावेनैवोपपत्तेः विशिष्टवैशिष्ट्यबुद्धित्वस्यार्थसमाजसिद्धत्वात्.
OR ELSE,
Even if we accept for the time being that visheshaNatA-avachchhedaka-prakAraka-jnAna-tva is the kAraNatA-avachchhedaka and vishishTa-vAishishTya-avagAhi-jnAna-tva is the kAryatA-avachchhedaka, still there are some situations where visheshaNatA-avachchhedaka-prakAraka-jnAna is not possible at all. There, you also hold the vishishTa-vaishishTya-avagAhi-jnAna to arise as follows - First visheshaNa-jnAna in visheshya AND then visheshaNAntara-jnAna in visheshaNa. So, let the same logic be applied in all cases.
For example, let us take - नीलघट-वान् चैत्र:. Here, Chaitra is visheshya and blue-pot is the visheshaNa. The visheshaNatA-avachchhedaka is blue-ness. Now, this knowledge नीलघट-वान् चैत्र: can sometimes be preceded by a doubt in the form of “घटो नीलो न वा, whether the pot is blue or not”. Thus, there is no visheshaNatA-avachchhedaka-prakAraka-jnAna in the form of neelatva-jnAna but the jnAna immediately before the jnAna नीलघट-वान् चैत्र: is samshaya-jnAna. There, the vishishTa-vaishishTya-avagAhi-jnAna i.e. नीलघट-वान् चैत्र:, arises in the form of विशेष्ये विशेषणं तत्र च विशेषणान्तरम्। That is first we know visheshya-pot and then we come to know blue-ness.
Similarly, in case of अहम् अज्ञः, first there will be visheshya-AtmA-jnAna, then the visheshaNa-jnAna i.e. perception of ajnAna, and then the visheshaNa of ajnAna, such as savishayakatva and jnAna-virOdhitva, are perceived.
Hence, there is no contradiction in the bhAvarUpatva of ajnAna.
Regards.
Sudhanshu Shekhar.