3.2.180
विप्रसम्भ्यो ड्वसंज्ञायाम्
Operational rule vidhi
The affix डु comes after the verb भू 'to be' when it is preceded by the उपसर्ग वि , प्र and सम् provided that the word to be formed does not mean an appellative.
Word by word (padaccheda)
Left context वि- प्र- सम्- भ्यः pañcamī · bahuvacanaSubstitute / term डु prathamā · ekavacanaRight context असंज्ञायाम् 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.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- 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").
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Full reading
वि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix डु comes after the verb भू 'to be' when it is preceded by the उपसर्ग वि , प्र and सम् provided that the word to be formed does not mean an appellative.
As विभुः 'all pervading'; प्रभुः 'lord'; सम्भुः 'Creator'.
Why do we say 'when it is not a proper name'? Observe विभूः 'a person called Vibhu'.
Vart:- The words मितद्रु &c, also are formed by this affix. As मितद्रु 'the sea'; शम्भुः 'causing happiness'.
Why have we applied डु and not क्विप् to this root, as the forms would have been the same in either case? We have done so for two purposes: (1) To prevent the rules relating to dhatus from applying to this. (2) To prevent the insertion of तुक् augment. Thus the Ist. dual of मितद्रु is मितद्रू, Ist. pl. is मितद्रवः । Here there is no substitution of उकङ् which the rule 6.4.77 required, if द्रु had retained its dhatu characteristic; so also this rule of accent in 6.1.175 does not apply to Instrumental sing. मितद्र्वा &c, (2.) We have no त् which rule 6.1.71 required. मितं द्रवति = मितद्रुः ।
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.