आतश्चोपसर्गे

Operational rule vidhi

The affix अण् comes after those verbs which end in long आ when an उपसर्ग is in composition and when the word to be formed is feminine.

Word by word (padaccheda)

Left context आतः pañcamī · ekavacanaIndeclinable च avyayaRight context 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.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

आतः च

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

Commentary

The affix अण् comes after those verbs which end in long आ when an उपसर्ग is in composition and when the word to be formed is feminine.
This supersedes क्तिन्. Thus प्रदा, प्रधा, उपदा, उपधा, &c.

Vart:- For the purposes of this rule the particles श्रत् and अन्तर् should be treated like upasargas. Thus श्रद्धा 'faith' अन्तर्द्धा 1.4.59.

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