क्रीङ्जीनां णौ

Operational rule vidhi

The substitution of आ for the diphthong takes place in the causatives of the roots क्री 'to buy, to purchase', इ 'to study' and जि 'to conquer'.

Word by word (padaccheda)

Target क्री- इङ्- जीनाम् ṣaṣṭhī · bahuvacanaRight context णौ 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").

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

क्री-इङ्-जीनाम् णौ

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

Commentary

The substitution of आ for the diphthong takes place in the causatives of the roots क्री 'to buy, to purchase', इ 'to study' and जि 'to conquer'.
Thus क्रापयति, अध्यापयति and जापयति ॥ The augment प् is added by 7.3.36, since these roots end in long आ ॥

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