4.1.101
यञिञोश्च
Operational rule vidhi
The affix फक् is added in denoting a descendent after a प्रातिपदिक (Nominal Stem) ending in the affixes यञ् or इञ्.
Word by word (padaccheda)
Target यञ्- इञोः ṣaṣṭhī · dvivacanaIndeclinable च avyaya
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
यञ्- इञोः च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix फक् is added in denoting a descendent after a प्रातिपदिक (Nominal Stem) ending in the affixes यञ् or इञ्।
The फक् of this sutra has, like that of the preceding sutra, the force of a Yuvan affix, since it is to be added to words formed by the Gotra affixes यञ् and इञ् ॥ Thus गर्ग + यञ् 4.1.105 = गार्ग्यः ॥ गार्ग्य + फक् = गार्ग्यायणः ॥ दक्ष + इञ् = दाक्षिः; दाक्षि + फक् = दाक्षायणः ॥ It is not every word which ends in यञ् or इञ् which takes the Yuvan affix फक्; but only that word where the affix यञ् or इञ् has the force of a Gotra affix. Thus the affix यञ् is added by 4.3.10 to denote proximity to a sea. As द्वीप + यञ् = द्वैप्यः ॥ This word will not take the affix फक् ॥ Similarly by 4.2.80 the affix इञ् is added to the words सुतंगम &c, the force of the affix being चातुरर्थिक ॥ Thus सौतंगमिः. This word will not take the affix फक् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.