4.2.5
संज्ञायां श्रवणाश्वत्थाभ्याम्
Operational rule vidhi
The affix above ordained is elided by लुप् after the words 1. श्रवण and 2. अश्वथ when the whole word so formed is an appellation and there is specification of time.
Word by word (padaccheda)
Right context संज्ञायाम् saptamī · ekavacanaLeft context श्रवण- अश्वत्थाभ्याम् pañcamī · 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").
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
संज्ञायाम् श्रवण-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix above ordained is elided by लुप् after the words 1. श्रवण and 2. अश्वथ when the whole word so formed is an appellation and there is specification of time.
Thus श्रवणा रात्रिः, अश्वत्थो मुहूर्तः "the night called Sravana; the Muhurta called Asvattha". The affix being elided by 'lup', why should not 1.2.51 apply here? We should say श्रवणा रात्रिः and not श्चवण रात्रिः The reason is that श्रवणा is an irregularly formed word, as Panini himself uses it in sutra 4.2.23. Why do we say 'when it is a Name or Sanjna'? Observe श्रावणी or आश्वत्थी रात्रिः ।
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.