समवप्रविभ्यः स्थः

Operational rule vidhi

When any of the उपसर्गs - सम् , अव, प्र, वि - is attached to the verb 'स्था', it gets the प्रत्ययाः of आत्मनेपद.

Word by word (padaccheda)

Left context सम्- अव- प्र- विभ्यः pañcamī · bahuvacanaLeft context स्थः pañcamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

सम्-अव-प्र-विभ्यः स्थः

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

Commentary

After the verb स्था 'to stand', preceded by सम् , अव , प्र , वि , the आत्मनेपद affix is used.
As संतिष्ठते 'he stays with,' अवतिष्ठते 'he waits patiently,' प्रतिष्ठते 'he sets forth,' वितिष्ठते 'he stands apart.'

Vart:- The verb स्था when preceded by आङ् and meaning 'solemn declaration' takes atmanepada terminations; as अस्ति संस्कारमात्रमातिष्ठते ॥ Or to take another example, जलं विशं वा तव कारणादास्थास्ये 'for thee I shall surely have recourse to water or poison.'

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