deriv SD cv (292) ashtadhyayi.com hei.de L 292 ETT STT a 8.4.1 ALPH OLDHOMEPAGE NEWHOMEPAGE

ra;SAbhyAn no Nas samAna-pade

रॱषाभ्यां नो णः समानॱपदे ONPANINI 84001

n न् becomes N ण् after r र् S ष् R ऋ RR ॠ within the same pada.

This change is called /Natvam ("Na ण-ness").

vistR- विस्तृॱ + /kta
→ vistIr- विस्तीर् + na न
→ **vistIrNa- विस्तीर्णॱ "extended"

saGkIr सङ्कीर् + na- नॱ → **saGkIrNa- सङ्कीर्णॱ "narrow"

**pitR- पितृॱ + /Am
→ pitRR- पितॄॱ + /nAm
→ **pitRRNAm पितॄणाम् "of fathers"

There is a very important difference between the /Natvam rules and the /Satvam rules. The /Satvam will only change into S ष् that s स् that is at the start of an affix (or of a Sa-root); /Natvam however will change n न् everywhere —

**brahman- ब्रह्मन् + /Gas → !**brahmanas ब्रह्मनस्

See next and previous rules for exceptions.

See also Natvam comments.

Why do we say "in same pada" ?

No N ण् here —

gurur nRtyati गुरुर्नृत्यति "teacher is dancing"

Why does your translation mention R ऋ RR ॠ? The ra;Sa रॱष in the sUtra only means r र् S ष्!

There is a /vArttika, RvarNAccetivaktavyam ऋवर्णाच्चेतिवक्तव्यम् "after the /savarNa of R ऋ too". Those /savarNa of R ऋ, according to commentarists, are R ऋ, RR ॠ, and L ऌ.