4.2.101
द्युप्रागपागुदक्प्रतीचो यत्
Operational rule vidhi
After the words 1. दिव् 2. प्राच् 3. अपाच् 4. उदच् and 5. प्रत्यच् , the affix यत् is added in the remaining senses.
Word by word (padaccheda)
Left context द्यु- प्राक्- अपाक्- उदक्- प्रतीचः pañcamī · ekavacanaSubstitute / term य prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
द्यु-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the words 1. दिव् 2. प्राच् 3. अपाच् 4. उदच् and 5. प्रत्यच् , the affix यत् is added in the remaining senses.
Thus दिव्य꣡म्, प्रा꣡च्यम्, अपाच्य॑म्, उदीच्य॑म्, 4.4.130 and प्रतीच्य॑म् ॥ For accent see 6.1.213. When these words are used as Indeclinables, and denote time, they take also the affixes 'tyu' and 'tyul', e.g, प्राक्तनम् 4.3.25. The word अपाच् means south.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.