4.4.72
कठिनान्तप्रस्तारसंस्थानेषु व्यवहरति
Operational rule vidhi
The affix ठक् comes in the sense of 'who transacts business therein', after compounds ending in कठिन and after प्रस्तार, being in the Locative -7th case in construction.
Word by word (padaccheda)
Right context कठिन- अन्त- प्रस्तार- संस्थानेषु saptamī · bahuvacanaVerb व्यवहरति tiṅanta
- 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").
- Verb A finite verb form (tiṅanta).
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Full reading
कठिन-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ठक् comes in the sense of 'who transacts business therein', after compounds ending in कठिन and after प्रस्तार, being in the Locative -7th case in construction.
Thus वंशकठिने व्यवहरति = वांशकठिनिकः 'whose occupation is in a bamboo thicket' or 'who does what is proper to be done in such a place' i.e. तस्मिन्देशे या क्रिया यथानुष्ठेया तां तथैवानुतिष्ठेति ॥ So also वार्ध्रकठिनिकः ॥ So also प्रास्तारिकः, सांस्थानिकः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.