न यदि

Operational rule vidhi

The affix लृट् (2nd Future) is not applied in the sense of the past when the उपपद denoting recollection has in connection with it the particle यत्.

Word by word (padaccheda)

Indeclinable न avyayaRight context यदि saptamī · ekavacana

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

न यदि

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix लृट् (2nd Future) is not applied in the sense of the past when the उपपद denoting recollection has in connection with it the particle यत्।
This prohibits लृट् which the verb वस् obtained from the last sutra. As अभिजानासि देवदत्त यत् कश्मीरेष्ववसाम 'thou rememberest Devadatta how we did dwell in Kashmir'. Here the mere fact of dwelling is recollected, there being no other idea implied; therefore the subsequent aphorism has no scope here. That aphorism has its scope, when with recollection, is added another dependent idea or action, without which the sentence is not complete.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.