एकवचनस्य च

Operational rule vidhi

This substitution of अत् is made in the singular number also in the Ablative -5th case after the अङ्ग (stems) युष्मद् and अस्मद्.

Word by word (padaccheda)

Target ṣaṣṭhī · ekavacanaIndeclinable च avyaya

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

च

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

Commentary

This substitution of अत् is made in the singular number also in the Ablative -5th case after the अङ्ग (stems) युष्मद् and अस्मद्।
As त्वद् and मद् ॥ For the substitution of त्व and म see 7.2.97; and त्व and म + अत् and मत् by 6.1.97.

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