त्वाहौ सौ

Operational rule vidhi

In the Nominative 1st-Case singular त्व is substituted for युष्म् and अह for अस्म्.

Word by word (padaccheda)

Substitute / term त्वाहौ prathamā · dvivacanaRight context सौ saptamī · ekavacana

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").

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

त्वाहौ सौ

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In the Nominative 1st-Case singular त्व is substituted for युष्म् and अह for अस्म्।
Thus त्वम् and मह्यम्, परमत्वम्, परमाहम्, अतित्वम् and अत्यहम् ॥ See 7.1.28, 6.1.97 and 6.1.107.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.