5.4.86
तत्पुरुषस्याङ्गुलेः संख्याव्ययादेः
Operational rule vidhi
The affix अच् comes after a तत्-पुरुष समास ending in the word अङ्गुलि when a numeral or an indeclinable precedes it.
Word by word (padaccheda)
Target ṣaṣṭhī · ekavacanaTarget अङ्गुलेः ṣaṣṭhī · ekavacanaTarget सङ्ख्या- अव्ययादेः ṣaṣṭhī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
अङ्गुलेः सङ्ख्या-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix अच् comes after a तत्-पुरुष समास ending in the word अङ्गुलि when a numeral or an indeclinable precedes it.
Thus द्वे अंगुलो प्रमाणमस्य = द्व्यंगुलम्, त्र्यंगुलम् ॥ This compounding takes place by 2.1.51. This is a Tadhitartha compound, the taddhita affix मात्रच् being elided by the Vartika प्रमाणे लो द्विगोर्नित्यम् "there is always the elision of the affix मात्रच् denoting measure when a Dvigu compound is formed". See 5.2.37 Vart.)). So also when an Indeclinable precedes it: as निर्गामंगुलिभ्यो = निरंगुलम्, अत्यंगुलिः पुरुषः ॥ Why do we say when a Tatpurusha compound? Observe पंचांगुलिः, अत्यंगुलिः पुरुषः ॥ The word "Tatpurusha" is understood in all the subsequent sutras up to 5.4.106.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.