णेरनिटि

Operational rule vidhi

The इ of the verbal अङ्ग (stem) formed with the affix णि is elided before an आर्धधातुक affix which does not take the augment इट् .

Word by word (padaccheda)

Target णेः ṣaṣṭhī · ekavacanaRight context अनिटि saptamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

णेः अनिटि

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

Commentary

The इ of the verbal अङ्ग (stem) formed with the affix णि is elided before an आर्धधातुक affix which does not take the augment इट् ।
This debars इयङ्, the semi-vowel य, the guna, Vriddhi and the long substitutions. Thus अततक्षत्, अररक्षत्, आशिशत्, कारणा, हारणा, कारकः, हारकः, कार्यते, हार्यते and ज्ञीप्सति (see (VII.4. I) for the shortening of the stem of the Aorists in these). Why do we say 'not having the augment इट्?' Observe कारयिता and हारयिता ॥

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