प्रागिवात्कः

Heading adhikāra काधिकारः

The affix क governs all sūtras as far as इवे प्रतिकृतौ (5.3.96).

Word by word (padaccheda)

Indeclinable प्राक् avyayaFrom / after इवात् pañcamī · ekavacanaTerm / subject कः prathamā · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
From / after Pañcamī (5th case): "from X" or "after X"; in headings, often the limit of their scope.
Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

प्राक् इवात् कः

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

Commentary

The affix क governs all sūtras as far as इवे प्रतिकृतौ 5.3.96.
Properly speaking क extends only upto 5.3.86. Thus in the sutra अज्ञाते 5.3.73, the word क must be supplied to complete the sense. As अश्वकः, गर्दभकः ॥ This affix क does not come after finite verbs (तिङन्त), but the affix अकच् 5.3.71 comes after such verbs. In other words, the phrase तिङश्च 5.3.56, should be connected, by way of anuvritti, with the next sutra, and not with this.

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