7.2.108
इदमो मः
Operational rule vidhi
The word इदम् gets a मकारादेश when followed by the सुँ-प्रत्यय.
Word by word (padaccheda)
Target इदमः ṣaṣṭhī · ekavacanaSubstitute / term मः prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
इदमः मः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
इदमः → मः
Replace idamaḥ with maḥ. Inherited words (anuvṛtti) may add further conditions.
Commentary
म् is substituted for the final म् of इदम् in the Nominative 1st-Case singular.
As इयम्, अयम् ॥ The substitution of म् for म् is to prevent the अ substitution of 7.2.102. The case-ending is elided by 6.1.68, and य substituted by 7.2.110.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.