2.4.51
णौ च संश्चङोः
Operational rule vidhi
गाङ् is optionally the substitute of इङ् is the causative णि , when that causative takes the affix सन् (Desiderative) and चन् (Aorist).
Word by word (padaccheda)
Right context णौ saptamī · ekavacanaIndeclinable च avyayaRight context सन्- चङोः saptamī · dvivacana
- 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
णौ च सन्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
गाङ् is optionally the substitute of इङ् is the causative णि , when that causative takes the affix सन् (Desiderative) and चन् (Aorist).
अधिजिगापयिषति or अध्यापिपयिषति 'he desires to teach.' The form is thus evolved : गा + णिच् = गापि 7.3.36; then by the rules already stated, we get the above form with the affix सम्. अध्यजीगपत् or अध्यापिपत् 'he taught.' The ई is changed into आ by 6.1.48. Thus इ + णिच् = आ + णिच् = आ + प् + इ = आपि. This rule applies to the desideratives of causatives and aorist of causatives.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.