4.2.115
भवतष्ठक्छसौ
Operational rule vidhi
The affixes ठक् and छस् come after वृद्ध word भवत् , in the remaining senses.
Word by word (padaccheda)
Left context भवतः pañcamī · ekavacanaSubstitute / term - औ 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
भवतः ठक्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affixes ठक् and छस् come after वृद्ध word भवत् , in the remaining senses.
The word भवत् is a Vriddha word because it belongs to tyadadi class 1.1.74. This rule debars छ of the last aphorism. In the affix, छस्, the final स् is indicatory, showing that the word भवत् before this affix gets the designation of Pada पद 1.4.16. Thus भवत् + ठक् = भावत्कः; भवत् + छस् = भवतीयः ॥
But when the word भवत् is not treated as Vriddha, then it takes the general affix अण्; as भावतः ॥ This is the case when भवत् is derived by affixing शतृ to भू ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.