नरे संज्ञायाम्

Operational rule vidhi

The final vowel of विश्व is lengthened before नर when the compound is a Name.

Word by word (padaccheda)

Right context नरे saptamī · ekavacanaRight context संज्ञायाम् saptamī · 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").

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Full reading

नरे संज्ञायाम्

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

Commentary

The final vowel of विश्व is lengthened before नर when the compound is a Name.
Thus विश्वानरः, वैश्वानरिः (the son of Vishvanara). But विश्वनरः = विश्वे नरा यस्य when it is not a name.

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