आत्माध्वानौ खे

Operational rule vidhi

The finals of the अङ्ग (stems) आत्मन् and अध्वन् remain unchanged before the affix ख.

Word by word (padaccheda)

Substitute / term आत्मा- अध्वानौ prathamā · dvivacanaRight context खे 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

आत्मा-अध्वानौ खे

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

Commentary

The finals of the अङ्ग (stems) आत्मन् and अध्वन् remain unchanged before the affix ख।
Thus आत्मने हितं = आत्मनीनः 5.1.9, अध्वानमलङ्गामी 5.2.16 = अध्वनीनः ॥ But प्रत्यात्मम् and प्राध्वम् ॥ The first is formed by the samasanta affix टच् added to the avyayibhava 5.4.108, and the latter by अच् 5.4.85.

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