2.2.28
तेन सहेति तुल्ययोगे
Operational rule vidhi
The word सह 'together' is compounded with a word ending with the third case-affix and the compound is बहुव्रीही ; provided that, the companion and the person accompanied are equally effected by any action or thing, in the same manner.
Word by word (padaccheda)
With / by तेन tṛtīyā · ekavacanaIndeclinable सह avyayaIndeclinable avyayaRight context तुल्ययोगे saptamī · ekavacana
- With / by Tṛtīyā (3rd case): accompaniment or means.
- 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").
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Full reading
तेन सह तुल्ययोगे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The word सह 'together' is compounded with a word ending with the third case-affix and the compound is बहुव्रीही ; provided that, the companion and the person accompanied are equally effected by any action or thing, in the same manner.
Thus सह पुत्रोणागतः=सपुत्रः ( 6.3.82, सह changed to स ) 'he has come accompanied by his son'. सच्छात्रः 'accompanied by the pupil.' सकर्मकरः 'accompanied by the servant.'
Why do we say 'tulya-yoga'? Witness 'the she-ass carries the whole burden, though there exist her ten sons.'
How do we get the forms like सकर्मकः, सलोमकः, सपक्षकः &c., in which there is no 'tulya-yoga'? It shows that this condition is of limited operation (तुल्य गोगबचनं प्रायिकं).
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.