deriv SD cv (153) ashtadhyayi.com hei.de L 153 ETT STT a 6.1.69 ALPH OLDHOMEPAGE NEWHOMEPAGE

eG;hrasvAt sambuddheH

एङ्ह्रस्वात्सम्बुद्धेः ONPANINI 61069

(Replace /sambuddhi with /lopa) after e ए, o ओ, and short.

This rule happens to apply to nounbases that end in a अ i इ u उ R ऋ, /nadI I ई and /nadI U ऊ.

First, hrasvasyaguN... works, if it can.

Second, this rule erases the s स्.

After a अ nounbases —

**rAma- रामॱ m + /sambuddhi
rAma राम by this rule
→ !**rAma' रामऽ "hey rAma राम"

azva- अश्वॱ m + /sambuddhi → !**azva' अश्वऽ "hey horse"

kRSNa- कृष्णॱ m + /sambuddhi → **kRSNa कृष्ण "hey kRSNa कृष्ण"

mitra- मित्रॱ n + /sambuddhi → !**mitra मित्र "hey friend"

After i इ —

he हे **agni- अग्निॱ + /sambuddhi
→ he हे agnes अग्नेस् by hrasvasyaguN...
→ he हे !**agne अग्ने by this rule

After u उ —

!**vAyo वायो

After R ऋ —

**pitR- पितृॱ m + /sambuddhi
→ pitR- पितृॱ + /lopa by this rule
→ !**pitar पितर् by RtoGisarv...

**mAtR- मातृॱ f + /sambuddhi → !**mAtar मातर्

After /nadI I ई —

**nadI- नदीॱ + /sambuddhi
→ nadis नदिस् by ambArthanady...
→ nadi नदि by this rule
→ he हे !**nadi नदि

After /nadI U ऊ —

**vadhU- वधूॱ + /sambuddhi
→ vadhus वधुस् by ambArthanady...
→ vadhu वधु by this rule
→ !**vadhu' वधुऽ "hey young lady"

Why doesn't hrasvasyaguN... kick in after ambArthanady...?

Good question. Rule hrasvasyaguN... only works when its previous rule ambArthanady... doesn't work.

How do we know that?

If it were to work, it would make the undesired forms henade, hevadho — if /pANini had wanted those, the word nadI नदी in rule ambArthanady... would be redundant, and the rule would have been shrunk to ambArthasyaguNaH.

Why can't this rule work before hrasvasyaguN...? If it could work first, then the eG एङ् in the sUtra would be redundant.

You answered your own question. As there is an eG एङ्, and /pANini never does "redundant", it follows that it CANNOT work first.