विभाषोपसर्गे

Operational rule vidhi

The object of the verb दिव् when having the above-mentioned sense of 'dealing' or 'stalking', optionally takes the 6th-Case, when preceded by an उपसर्ग (preposition).

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight 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

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

Commentary

The object of the verb दिव् when having the above-mentioned sense of 'dealing' or 'stalking', optionally takes the 6th-Case, when preceded by an उपसर्ग (preposition).
Ex. शतस्य शतं वा प्रति दीव्यति 'he deals in or stakes a hundred.' But no option is allowed when the verb is simple as in the last aphorism; nor does this rule apply when the sense is not that of dealing or gambling. As, शलाकां प्रति दीव्यति 'he throws the missile.'

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