7.1.27
युष्मदस्मद्भ्यां ङसोऽश्
Operational rule vidhi
अश् -- अनेकाल्शित्सर्वस्य (1.1.55), is substituted for the Genitive 6th-Case ending अस् after the अङ्ग (stems) युष्मद् and अस्मद्.
Word by word (padaccheda)
Left context युष्मद्- अस्मद्भ्याम् pañcamī · dvivacanaTarget ङसः ṣaṣṭhī · ekavacanaSubstitute / term अश् 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.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
युष्मद्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
ङसः → अश् / युष्मद्-
Replace ṅasaḥ with aś when it comes after yuṣmad-asmadbhyām. Inherited words (anuvṛtti) may add further conditions.
Commentary
अश् -- अनेकाल्शित्सर्वस्य 1.1.55, is substituted for the Genitive 6th-Case ending अस् after the अङ्ग (stems) युष्मद् and अस्मद्।
Thus तव and मम ॥ The indicatory श् of अश् shows that by 1.1.55, the whole of the affix अस् is to be replaced : otherwise it would have replaced only the first letter of the affix; and the affix not being a substitute-affix, rule 7.2.89, would not be applicable to it. The तव is substituted for युस्मद्, and मम for अस्मद् by 7.2.96; and तव + अ (अश्), and मम + अ = तव and मम् by 6.1.97.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.