3.1.6
मान्बधदान्शान्भ्यो दीर्घश्चाभ्यासस्य
Operational rule vidhi
The affix सन् comes after the verbs मान 'to honour', बध् 'to bind', दान् 'to cut', and शान् 'to whet', and long ई is the substitute of इ -- सन्यतः (7.4.79) of the re-duplicate -- पूर्वोऽभ्यासः (6.1.4) syllable.
Word by word (padaccheda)
Left context मान्- बध- दान्- शान्भ्यः pañcamī · bahuvacanaSubstitute / term prathamā · ekavacanaIndeclinable च avyayaTarget ṣaṣṭhī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
मान्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
→ / मान्-
Replace abhyāsasya with dīrghaḥ when it comes after mān-badha-dān-śānbhyaḥ. Inherited words (anuvṛtti) may add further conditions.
Commentary
The affix सन् comes after the verbs मान 'to honour', बध् 'to bind', दान् 'to cut', and शान् 'to whet', and long ई is the substitute of इ -- सन्यतः 7.4.79 of the re-duplicate -- पूर्वोऽभ्यासः 6.1.4 syllable.
The सन् is to be added only then, when the sense of the desiderative verb is as below: मीमांसते 'he investigates', बीभस्सते 'he loathes', दीदांसते 'he straightens', शीशांसते 'he sharpens'. The verbs given in this and the preceding sutra, are Desiderative in form, but not in meaning. The word 'optionally' in the next sutra, may be read into this also, whereby the addition of सन् becomes optional. Thus मानयति, बाधयति, दानयति and निशानयति are also valid forms.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.