नन्वोर्विभाषा

Operational rule vidhi

The affix लट् (Present Tense) comes optionally after a verb in denoting past time, in reply to an interrogation, when the words न 'not' and नु 'what of that' are in connection with it.

Word by word (padaccheda)

Right context नन्वोः saptamī · dvivacanaSubstitute / term prathamā · ekavacana

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").
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

नन्वोः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix लट् (Present Tense) comes optionally after a verb in denoting past time, in reply to an interrogation, when the words न 'not' and नु 'what of that' are in connection with it.
As, अकार्षीः कटं देवदत्त -- न करोमि भोः or नाकार्षम्; -- अहं नु करोमि or अहं न्वकार्षम् 'Devadatta, did you make the mat ? -- No I did not; -- what of that, I did'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.