कपिबोधादाङ्गिरसे

Operational rule vidhi

The affix यञ् comes in the sense of a गोत्र (Patronymic) descendant after the words 1. कपिand 2. बोध when the special descendants of the family of अङ्गिरस are meant.

Word by word (padaccheda)

Left context कपि- बोधात् pañcamī · ekavacanaRight context आङ्गिरसे saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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

कपि-बोधात् आङ्गिरसे

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

Commentary

The affix यञ् comes in the sense of a गोत्र (Patronymic) descendant after the words 1. कपिand 2. बोध when the special descendants of the family of अङ्गिरस are meant.
Thus कपि + यञ् = काप्यः 'the grand-son or a still lower descendant of 'Kapi' of the family of Angiras.' So also बौध्यः ॥

Why do we say of the family of Angiras ? Observe कापेयः 4.1.122 "the gotra-descendant of Kapi" so also बौधिः formed by इञ् because it is a Non-Rishi word or because it belongs to Bahvadi 4.1.96 class.

The word कपि occurs in Gargadi class. The present sutra declares a restriction i. e. the 'yan' is to be applied only when Angirasa descendant is meant. It is included in the Gargadi class also for the purpose of applying 4.1.18. Thus काप्यायनी "grand-daughter or a still lower descendant of Kapi."

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