6.3.78
सहस्य सः संज्ञायाम्
Operational rule vidhi
स is substituted for सह , in a Name.
Word by word (padaccheda)
Target सहस्य ṣaṣṭhī · ekavacanaSubstitute / term सः prathamā · ekavacanaRight context संज्ञायाम् saptamī · ekavacana
- 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.
- 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").
Full reading
सहस्य सः संज्ञायाम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
सहस्य → सः / संज्ञायाम्
Replace sahasya with saḥ when saṃjñāyām follows. Inherited words (anuvṛtti) may add further conditions.
Commentary
स is substituted for सह , in a Name.
Thus साश्वत्थम्, सपलाशम्, सशिंशपम् ॥ Why when it is a Name? Observe सहयुध्वा, सहकृत्वा ॥ The word स꣡ह has acute on the first syllable, because all Particles have acute on the first syllable. The substitute स coming in the room of the acute स and the grave ह, will have an accent mid-way between स꣡ acute and ह॒ grave, namely, it would have the svarita accent. But, as a matter of fact, it has the acute accent. As स꣡पुत्रः, स꣡भार्यः ॥ These are Bahuvrihi. In Avyayibhava, the samasa-accent will prevail 6.1.223, as सेष्टि꣡, सपशुबन्ध꣡म् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.