6.4.163
प्रकृत्यैकाच्
Operational rule vidhi
A monosyllabic भ अङ्ग (stem) retains its original form without undergoing any change before the affixes 1. इष्ठ 2. इमन् and 3. ईयस् .
Word by word (padaccheda)
With / by प्रकृत्या tṛtīyā · ekavacanaSubstitute / term एकाच् prathamā · ekavacana
- With / by Tṛtīyā (3rd case): accompaniment or means.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
प्रकृत्या एकाच्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
A monosyllabic भ अङ्ग (stem) retains its original form without undergoing any change before the affixes 1. इष्ठ 2. इमन् and 3. ईयस् ।
Thus स्रजिष्ठः, स्रजीयान्, स्रजयति from स्रग्विन्, the विन् being elided by 5.3.65, the stem thus becoming monosyllabic. स्रजयति is the causative, formed on the model of इष्ठ by the Vartika under 6.4.155. So also स्रुचिष्टः, स्रुचीयान् and स्रुचयति from स्रुग्वत्, the मतुप् being elided as before. Why do we say 'a mono-syllabic stem? Observe वसिष्ठः from वसुमत् ॥ This rule is an exception to 6.4.155.
Vart:- राजन्य, मनुष्य and युवन् retain their original form unchanged, before the affix अक ॥ As, राजन्यानां समूहः = राजन्यकम्, मानुष्यकम् ॥ This debars the elision of य required by 6.4.15. So यूनो भावः = यौवनिकः with वुञ् affix 5.1.133, in supersession of 6.4.144.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.