उपसर्गे च संज्ञायाम्

Operational rule vidhi

The affix ड comes after the verb जन् 'to be produced', with a past signification, when an उपसर्ग is in composition and when the sense is simply appellative.

Word by word (padaccheda)

Right context saptamī · ekavacanaIndeclinable च avyayaRight 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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

च संज्ञायाम्

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

Commentary

The affix ड comes after the verb जन् 'to be produced', with a past signification, when an उपसर्ग is in composition and when the sense is simply appellative.
The term here being simply appellative, and not descriptive, cannot be explained by giving the signification of its component elements. As प्रजाः 'people', or 'a son'; as in the sentence अथेमा मानवी प्रजाः ।

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