5.4.89
न संख्यादेः समाहारे
Operational rule vidhi
This substitution of अह्न for अहन् does not take place after a numeral when it forms a collective noun meaning a number of days taken as a unity.
Word by word (padaccheda)
Indeclinable न avyayaTarget सङ्ख्यादेः ṣaṣṭhī · ekavacanaRight context समाहारे saptamī · ekavacana
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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 सङ्ख्यादेः समाहारे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
This substitution of अह्न for अहन् does not take place after a numeral when it forms a collective noun meaning a number of days taken as a unity.
This substitution is prohibited in the case of Samahara-Tatpurusha. Thus द्वे अहनी समाहृते = द्व्यहः, so also त्र्यहः ॥ Here rule 5.4.9 applies.
Why do we say "when meaning a collective noun?" Observe द्वयोरह्नोर्भवो = द्व्यह्नः, त्र्यह्नः ॥ This is a Taddhitartha Dvigu compound formed by 1.1.5; the affix अण् denoting तत्र भवः 4.3.53 is elided by 4.1.88: and the final अन् of अहन् is elided by 6.1.145.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.