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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Nityānanda Miśra
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