इच्छार्थेभ्यो विभाषा वर्तमाने

Operational rule vidhi

After roots meaning 'to wish' the लिङ् (Benedictive) is optionally used denoting the present time.

Word by word (padaccheda)

Left context इच्छार्थेभ्यो pañcamī · bahuvacanaSubstitute / term prathamā · ekavacanaRight context वर्त्तमाने saptamī · ekavacana

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.
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

इच्छार्थेभ्यो वर्त्तमाने

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

Commentary

After roots meaning 'to wish' the लिङ् (Benedictive) is optionally used denoting the present time.
This ordains लिङ् where there would have been otherwise लट्. Thus इच्छति or इच्छेत् 'he wishes'; वष्टि or उश्यात्; कामयते or कामयेत ।

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