3.4.27
अन्यथैवंकथमित्थंसु सिद्धाप्रयोगश्चेत्
Operational rule vidhi
When the words 1. अन्यथा 'otherwise' 2. एवम् 'so' 3. कथम् 'how' 4. इत्थम् 'thus' are compounded with the verb, the णमुल् comes after कृ 'to make', if it be such that its omission would be unobjectionable.
Word by word (padaccheda)
Right context अन्यथा- एवम्- कथम्- इत्थम्- सु saptamī · bahuvacanaSubstitute / term सिद्धाप्रयोगः prathamā · ekavacanaIndeclinable चेत् avyaya
- 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.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
अन्यथा-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
When the words 1. अन्यथा 'otherwise' 2. एवम् 'so' 3. कथम् 'how' 4. इत्थम् 'thus' are compounded with the verb, the णमुल् comes after कृ 'to make', if it be such that its omission would be unobjectionable.
When is the non-employment of कृञ् valid ? When the same sentence will remain correct by omitting कृ, i. e. when without employing it, the same idea will be expressed. Thus अन्यथाकारं, एवङ्कारं, कथङ्कारं or इत्थङ्कारं भुङ्क्ते 'he eats otherwise, he eats so, how does he eat, or he eats thus'. In fact, the sentence अन्यथाकारं भुङ्क्ते is equivalent to अन्यथा भुङ्क्ते ।
Why do we say 'if the non-employment would be valid'? Witness अन्यथा कृत्वा शिरो भुङ्क्ते 'he eats, having turned his head aside'. Here कृञ् could not be spared.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.