A member asked offline why there is no ‘jaśtva’ (‘t’ to ‘d’ change) by ‘jhalāṃ jaśo’nte’ (A. 8.2.39) in sat + ya = satya, unlike in cases like 
sat + yukti = sadyukti
sat + yoga = sadyoga 

I am copying the answer here too. The reason is that due to ‘yaci bham’ (A 1.4.18), ‘sat’ in ‘sat + ya’ is not a ‘pada’ but a ‘bha’. This is why ‘jhalāṃ jaśo’nte’ is not applicable. ‘yaci bham’ does not apply in ‘sadyukti’, ‘sadyoga’, etc.


On 3 October 2016 at 22:20, Howard Resnick <hr@ivs.edu> wrote:
Thank you.
Howard

On Oct 2, 2016, at 11:49 AM, Nityanand Misra <nmisra@gmail.com> wrote:

The derivations I am aware of are

sati sādhu satyam
sat + yat (tatra sādhuḥ, A 4.4.98) = satya

or

sate/sadbhyo hitaṃ satyam
sat + yat (tasmai hitam, A 5.1.5) = satya



On 2 October 2016 at 20:53, Howard Resnick <hr@ivs.edu> wrote:
Dear Scholars,

        Does the derivation of satya, truth, from ‘sat’ follow any particular set of rules for derivative nouns?

Thanks,
Howard
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