सौ च

Operational rule vidhi

For the words हन्, पूषन् and अर्यमन्, and for also the words that end in 'इन्', the उपधादीर्घ happens in case of the सुँ-प्रत्यय of प्रथमा-एकवचन.

Word by word (padaccheda)

Right context सौ saptamī · ekavacanaIndeclinable च avyaya

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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

सौ च

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

Commentary

The penultimate vowels of a अङ्ग (stem) ending in इन् , हन् , पूषन् or अर्यमन् are lengthened before the सु of the Nominative 1st-Case singular but not in Vocative Case singular.
Thus दण्डी, वृत्रहा, पूषा, अर्यमा ॥ The न् is elided by 8.2.7, and the case-affix by 6.1.68. in the Vocative singular we have हे दण्डिन्, हे पूषन्, हे वृत्रहन्, हे अर्यमन् ॥

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