6.1.28
प्यायः पी
Operational rule vidhi
पी is optionally the substitute of the root प्याय् 'to increase' before the निष्ठा affixes.
Word by word (padaccheda)
Target प्यायः ṣaṣṭhī · ekavacanaWord पी
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Word Case not marked in the source data.
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Full reading
प्यायः पी
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
पी is optionally the substitute of the root प्याय् 'to increase' before the निष्ठा affixes.
The root ओप्यायी वृद्धौ belongs to Bhvadi class. The indicatory आ shows that the affixes त and तवत् are changed into न and नवत् 8.2.45. Thus पीनं मुखम्, पीनौ बाहू, पीनसुरः ॥ The option here is also a regulated option (vyavasthita-vibhasha). The substitution takes place invariably when the root is without upasarga, and never when it is preceded by an upasarga. Thus प्रप्यानः आप्यानश्चन्द्रगाः ॥ The substitution, however, must take place when the preposition आङ् precedes the root, and the words अन्धुः and ऊधस् are in composition : as आपीनोन्धुः, आपीनमूधः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.