3.3.158
समानकर्तृकेषु तुमुन्
Operational rule vidhi
The affix तुमुन् comes after a verb when another verb meaning 'to wish' is in construction, provided that the agent of both the verbs is the same.
Word by word (padaccheda)
Right context समानकर्तृकेषु saptamī · bahuvacanaSubstitute / term तु prathamā · ekavacana
- 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").
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
समानकर्तृकेषु तुमुन्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix तुमुन् comes after a verb when another verb meaning 'to wish' is in construction, provided that the agent of both the verbs is the same.
Thus इच्छति, वष्टि or वाञ्छति भोक्तुम् 'he desires to eat'; कामयते भोक्तुम् 'he wishes to eat'; पिनाकपाणिं पतिम् आप्तुम् इच्छति 'desires to obtain for her husband the Pinaka-handed God Siva'.
But why do we say 'when the agent of the Infinitive and the verb are the same'? We can not say देवदतं भोक्तुम् इच्छति यज्ञदत्तः 'Yajnadatta wishes Devadatta to eat'; for here the agents of भुज् and इष् are not the same. We must say, भुञ्जानम् instead of भोक्तुम् ।
Why do not we use it here:- इच्छन् करोति 'wishing, he does'? Because the Infinitive is never found in such constructions. In other words, the Infinitive in तुम् is employed when both the verbs have the same agent.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.