अस्तिसिचोऽपृक्ते

Operational rule vidhi

A सार्वधातुक प्रत्यय which contains only one हल् letter (and no अच् letter) gets an 'ईट्' आगम when it follows either the अस् धातु or the सिच्-प्रत्यय.

Word by word (padaccheda)

Left context अस्तिसिचः pañcamī · ekavacanaRight context saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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").

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

अस्तिसिचः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

A single consonantal सार्वधातुक affix gets the augment ईट् after अस् (अस्ति) and after the Aorist character सिच् ।
As आसात्, आसीः; अकार्षीत्, असावीत् ॥ Why do we say a single-consonant affix? Observe अस्ति, अकार्षम् ॥

Vart:- Prohibition of the sthanivad-bhava must be stated when आह् is substituted for ब्रु 3.4.84, and भू for अस् 2.4.52, before the augment ईट् ॥ Therefore not here आत्थ and अभूत् ॥ The word आत्थ is thus formed. आह् + सिप् = आह् + थल् 3.4.84 = आथ् + थ 8.2.35 = आत् + थ 8.4.55 = आत्थ ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.