6.3.23
ऋतो विद्यायोनिसम्बन्धेभ्यः
Operational rule vidhi
The Genitive 6th-Case-affix is retained after a word ending in ऋ and expressing a relationship through study or blood.
Word by word (padaccheda)
Left context ऋतः pañcamī · ekavacanaLeft context विद्या- योनि- सम्बन्धेभ्यः pañcamī · bahuvacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Full reading
ऋतः विद्या-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The Genitive 6th-Case-affix is retained after a word ending in ऋ and expressing a relationship through study or blood.
Thus होतुरन्तेवासिन्, होतुः पुत्रः, पितुरन्तेवासिन् or पितुः पुत्रः ॥ Why do we say "a word ending in ऋ"? Observe आचार्यपुत्रः, मातुलपुत्रः ॥ The relationship through 'study' or 'blood' should be between the first and the second member of the compound. Therefore, the rule does not apply to होतृधनम्, पितृधनम्, होतृगृहम्, पितृगृहम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.