3.1.38
उषविदजागृभ्योऽन्यतरस्याम्
Operational rule vidhi
The affix आम् is optionally used after these - उष् 'to burn', विद् 'to know' and जागृ 'to wake', when लिट् (Perfect Tense) follows.
Word by word (padaccheda)
Left context उष- विद- जागृभ्यः pañcamī · bahuvacanaRight context अन्यतरस्याम् 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
उष-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix आम् is optionally used after these - उष् 'to burn', विद् 'to know' and जागृ 'to wake', when लिट् (Perfect Tense) follows.
Thus ओषाञ्चकार or उवोष, विदाञ्चकार or विवेद, जागराञ्चकार or जजागार. As there is an agreement in the present instance to regard the verb विद as ending in a short अ, guna is not substituted, as it would otherwise have been by rule 7.3.86.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.