[Advaita-l] [advaitin] Re: 'Satyasya Satyam..' of the Upanishad explained in the Bhagavatam

[raghavkumar00 at gmail.com]

https://en.wikipedia.org/wiki/Catu%E1%B9%A3ko%E1%B9%ADi 
Even the catuṣkoṭi logic (tetralemma) system does not obey any excluded middle requirement .
In fact we can assert based on the existence of coherent tetralemma (catuṣkoṭi) logic - we don’t need to obey the law of excluded middle for a proposition to be coherent

OmRaghav


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On Thursday, October 23, 2025, 12:36 PM, Jaldhar H. Vyas via Advaita-l <advaita-l at lists.advaita-vedanta.org> wrote:

On Wed, 1 Oct 2025, Vikram Jagannathan via Advaita-l wrote:

> << Good question that is handled in bhasya to Gita 2.16, which notes that
> existence and non-existence belong to ignorance/vyavaharika only. So, the
> notion of an object 'taken to be real' is itself an error/superimposition.
> The snake is taken to be real; the rope is what remains unchanged. Excluded
> middle maintained >>
>
> Yes, excluded middle is maintained in this perspective but the definition
> of real is no longer applicable.

We briefly discussed once before that adherence to the law of the excluded 
middle is not necessarily required to produce a rational philosophical 
system.  While researching something completely different, I came across 
this:

https://www.ams.org/journals/bull/2017-54-03/S0273-0979-2016-01556-4/S0273-
0979-2016-01556-4.pdf

which describes "constructive mathematics" which amongst other things does 
without the law of the excluded middle.  Yet it is not dismissed by 
professional mathematicians as mere crackpottery.

-- 
Jaldhar H. Vyas <jaldhar at braincells.com>
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