7.2.113
हलि लोपः
Operational rule vidhi
The 'इद्' part of the word 'इदम्' is removed when followed by a हलादि विभक्तिप्रत्यय of तृतीया to सप्तमी. But this conversion does not happen if the word इदम् has a ककार in it.
Word by word (padaccheda)
Right context saptamī · ekavacanaSubstitute / term prathamā · ekavacana
- 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.
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The इद् of इदम् is elided before a विभक्ति affix beginning with a consonant.
As आभ्याम्, एभिः, 7.1.11 एभ्यः एषाम्, एषु ॥ For म् is substituted अ by 7.2.102, and for अ + अ = अ by 6.1.97. The rule: 1.1.52 by which a substitute replaces only the final letter, does not apply here, on the maxim मानर्थके अलोऽन्त्यविधिः ॥ For no purpose is served by eliding merely the final म् of इदम् ॥ Hence इद् is elided. Or it may be said that the sutra does not teach the elision of इद्, but of अन् which was substituted for इद् by the preceding sutra.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.