5.1.115
तेन तुल्यं क्रिया चेद्वतिः
Operational rule vidhi
The affix वति (वत्) comes after a word in the Instrumental -3rd case in construction, in the sense of 'like that' when the meaning is 'similarity of action'.
Word by word (padaccheda)
With / by तेन tṛtīyā · ekavacanaSubstitute / term तुल्यम् prathamā · ekavacanaSubstitute / term क्रिया prathamā · ekavacanaIndeclinable चेत् avyayaSubstitute / term वतिः prathamā · ekavacana
- With / by Tṛtīyā (3rd case): accompaniment or means.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
तेन तुल्यम् क्रिया चेत् वतिः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix वति (वत्) comes after a word in the Instrumental -3rd case in construction, in the sense of 'like that' when the meaning is 'similarity of action'.
As ब्राह्मणेन तुल्यं वर्तते = ब्राह्मणवत्, राजवत् ॥
Why do we say "action"? The affix will not be joined when the similarity is in 'quality'. As पुत्रेणसह स्थूलः "as big as the son", पुत्रेण तुल्यः पिङ्गलः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.