तवममौ ङसि

Operational rule vidhi

In the Genitive 6th-Case singular तव is substituted for युष्म् and मम for अस्म्.

Word by word (padaccheda)

Substitute / term तवममौ prathamā · dvivacanaRight context ङसि 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").

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Full reading

तवममौ ङसि

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

Commentary

In the Genitive 6th-Case singular तव is substituted for युष्म् and मम for अस्म्।
As तव, मम, परमतव, परममम, अतितव, अतिमम ॥ The द् is elided by 7.2.90, and तव and मम + अ + अ 7.1.27 = तव and मम by 6.1.97.

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