3.4.110
आतः
Operational rule vidhi
For an आकारान्त अङ्ग, even when the सिच् प्रत्यय is removed, the झि-प्रत्यय of a ङित्-लकार is converted to जुस्.
Word by word (padaccheda)
Left context आतः pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
आतः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
When सिच् is elided जुस् is the substitute of झि after a लुङ् (Aorist) stem which ends in long आ।
The सिच् is elided by rule 2.4.77. Thus अदुः, अधुः, अस्थुः । In other words, in those cases, where सिच् is elided by rules 2.4.77, 2.4.78 and 2.4.79, only जुस् is the substitute of झि where the verbs end in long आ । In other words, this sutra restricts the scope of the last sutra, by which after every सिच्, जुस् was to replace झि ।
The Present sutra says that after verbs in which सिच् has been elided, जुस् does not replace झि in the case of any other verb than that which ends in long आ; it is thus a niyama rule.
Thus, by rule 2.4.77, सिच् is elided after the verb भू, but as भू does not end in long आ, its 3rd person plural Aorist will not be in जुस् । Thus, अनुभवन् । Here, by the last rule, and on the maxim that 'though सिच् is elided, yet its force remains 1.1.62', जुस् would have replaced झि; but the present sutra prohibits that. But where the सिच् is not elided, there, of course, जुस् does come. Thus अकार्षुः, अहार्षुः ।
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.