त्वे च

Operational rule vidhi

The feminine affixes ई and आ (ङी and आप्) diversely become short before the affix त्व.

Word by word (padaccheda)

Right context त्वे saptamī · ekavacanaIndeclinable च avyaya

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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

त्वे च

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

Commentary

The feminine affixes ई and आ (ङी and आप्) diversely become short before the affix त्व।
Thus अजाया भावः = अजत्वं or अजात्वं, रोहिणित्वं or रोहिणीत्वम् ॥ These are Vedic illustrations, no Names can be formed in त्व ॥

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