ह्वः सम्प्रसारणं च न्यभ्युपविषु

Operational rule vidhi

The affix अप् comes after the verb ह्वे 'to call' when the preposition नि , अभि , उप and वि are in composition with it and its semi-vowel is changed into the corresponding vowel.

Word by word (padaccheda)

Left context ह्वः pañcamī · ekavacanaSubstitute / term prathamā · ekavacanaIndeclinable च avyayaRight context नि- अभि- उप- वि- षु saptamī · bahuvacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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").

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

ह्वः च नि-अभि-उप-वि-षु

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

Commentary

The affix अप् comes after the verb ह्वे 'to call' when the preposition नि , अभि , उप and वि are in composition with it and its semi-vowel is changed into the corresponding vowel.
This debars घञ्. As नि + ह्वे + अप् = नि + हु + अ 6.1.108 = नि + हो + अ 7.3.84 = निहव 6.1.78 'invocation'; अभिहवः 'invocation'; उपहवः 'invitation'; विहवः 'calling'. But प्रह्वायः 'a summons'.

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