कतरकतमौ कर्मधारये

Operational rule vidhi

The words कतर and कतम when as first member of a compound optionally retain their original accent in a कर्मधारय समास.

Word by word (padaccheda)

Substitute / term कतर- कतमौ prathamā · dvivacanaRight context 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

कतर-कतमौ

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

Commentary

The words कतर and कतम when as first member of a compound optionally retain their original accent in a कर्मधारय समास।
Thus कतर꣡कठः or कतरकठः꣡, कतम꣡कठः or कतमकठः꣡ ॥ The word Karmadharaya is used for the sake of the next sutra, this sutra could have done without it, as 'katara' and 'katama' by the maxim of pratipadokta, form only Karmadharaya compound by 2.1.63.

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