6.4.160
ज्यादादीयसः
Operational rule vidhi
आ is substituted for the first letter of ईयस् after ज्य.
Word by word (padaccheda)
Left context ज्यात् pañcamī · ekavacanaSubstitute / term आत् prathamā · ekavacanaTarget ईयसः ṣaṣṭhī · 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.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
ज्यात् आत् ईयसः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
ईयसः → आत् / ज्यात्
Replace īyasaḥ with āt when it comes after jyāt. Inherited words (anuvṛtti) may add further conditions.
Commentary
आ is substituted for the first letter of ईयस् after ज्य।
As ज्यायान् ॥ ज्य is substituted for प्रशस्य by 5.3.61. 'Lopa' being shut out by the intervening यिट् 6.4.159, the आत् is read in this sutra. If the anuvritti of 'lopa' were present here, then the अ of ज्य would be lengthened before यस् by 7.4.25, and we would get the form ज्यायान् ॥ The peculiar construction of this sutra indicates the existence of the following maxim:- अङ्गवृत्ते पुनर्वृत्तावविधिः "when an operation which is taught in the angadhikara (VI.4, end-VII.4, end) has taken place, and another operation of the angadhikara is subsequently applicable, this latter operation is not allowed to take place." In 7.4.25, however, क्ङित् is understood, and lengthening could not have taken place by that rule.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.