8.2.54
प्रस्त्योऽन्यतरस्याम्
Operational rule vidhi
म is optionally substituted for the निष्ठा त after the root स्तयै preceded by प्र.
Word by word (padaccheda)
Left context प्रस्त्यः pañcamī · ekavacanaRight 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
प्रस्त्यः अन्यतरस्याम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
म is optionally substituted for the निष्ठा त after the root स्तयै preceded by प्र।
Thus प्रस्तीमः or प्रस्तीतः, प्रस्तीमवान् or प्रस्तीतवान् ॥ In the second alternative when म does not come, we first vocalise the root स्त्या into स्ती, and then add त ॥ Had samprasarana not taken place first, then the Nishtha त would have been changed to म after स्त्या by 8.2.43. But when samprasarana is once made, the root no longer has a semi-vowel and so there remains no occasion for the application of 8.2.43. See 6.1.23 for vocalisation.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.