3.1.107
भुवो भावे
Operational rule vidhi
After the root भू 'to be', in construction with a case-inflected word as its उपपद and when used without a preposition, the affix क्यप् is used to denote condition - भाव.
Word by word (padaccheda)
Left context भुवः pañcamī · ekavacanaRight context भावे saptamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
भुवः भावे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the root भू 'to be', in construction with a case-inflected word as its उपपद and when used without a preposition, the affix क्यप् is used to denote condition - भाव।
The words सुपि and अनुपसर्गे of previous sutras are understood in this. The anuvritti of यत् does not cover this aphorism. As ब्रह्मभुवं गतः = ब्रह्मत्वं गतः 'gone to or arrived at Brahmahood'; देवभुवं = देवत्वं गतः 'gone to divinity'.
The word bhava of this sutra governs the succeeding ones.
Why do we say 'in construction with a case-inflected word'? Otherwise it will take यत्; as भू + यत् = भो + यत् = भव्यम् (VI.I.79).
Why do we say 'not taking a preposition'? Observe प्रभव्यम् ।
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.