5.2.115
अत इनिठनौ
Operational rule vidhi
The affixes इनि and ठन् come in the sense of मतुप् after the प्रातिपदिक (Nominal Stems) ending in short अ and in the alternative मतुप् also comes.
Word by word (padaccheda)
Left context अतः pañcamī · ekavacanaSubstitute / term इनिठनौ prathamā · dvivacana
- 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.
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Full reading
अतः इनिठनौ
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affixes इनि and ठन् come in the sense of मतुप् after the प्रातिपदिक (Nominal Stems) ending in short अ and in the alternative मतुप् also comes.
Thus दण्डिन्, दण्डिकः, छत्रिन् nom. छत्री, छत्रिकः ॥ The word अन्यतरस्याम् 5.2.96 is understood here also, so we have मतुप्, as दण्डवान्, छत्रवान् ॥ Why do we say 'short अ'? Observe खट्वावान्. Here there is neither इन् nor ठन् ॥
These two affixes इनि and ठन् do not come after words of one syllable, after words ending in krit-affixes, after words denoting genus (jati), and when the construction is that of locative. As स्व and ख form only स्वावान्, खवान् ॥ Krit: as, कारकवान् ॥ Genus, as, व्याघ्रवान्, सिंहवान् ॥ Locative; as दण्डा अस्यां सन्ति = दण्डवती शाला ॥ There are, however, some exceptions to this, as krit :-- कार्यिन्, कार्यिकः हार्यिन्, हार्यिकः ॥ Genus (jati) :-- तण्डुलिन्, तण्डुलिकः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.