deriv SD cv (462) ashtadhyayi.com hei.de L 462 ETT STT a 7.2.80 ALPH OLDHOMEPAGE NEWHOMEPAGE

ato yeyaH अतो येयः ONPANINI 72080

After a अ, replace the yA या (of a flat hard /liG) with iy इय्.

That is just a way of saying —

Merge a and hard /yAsuT into ey .

Examples:

**bhava- + hard liG /tip
→ bhava- + /t'''
→ bhava- + /yAsuT + t
→ bhav + ey + r by this rule
→ **bhavet "he'd be"

**bhava- + hard liG /jhi
→ bhava- + /jus
→ bhava- + /yAsuT + /jus
→ bhav + ey + us by this rule
→ **bhaveyus "they'd be"

Why "a "?

See —

**dviS- + hard liG /tip
→ dviS- + /yAsuT + /t'''
→ dviS- + **yAs → **dviSyAt "he'd hate"

**dviS- + hard liG /jhi
→ dviS- + /yAsuT + /jus
→ dviS- + **yus → **dviSyus "they'd hate"

dviS + hard liG /jhi
→ dviS- + /jus
→ dviS- + /yAsuT + /jus
→ dviS- + yA + us
→ dviS- + **yus by usyapadAntAt
→ **dviSyus

See also atoyeyaH examples.

Why does this sUtra change a + /yAsuT + /jus into eyus before usyapadAntAt can snatch away the A ?

One word: /paratvAt.

I don't understand the wording of the original sUtra.

yA + iyaH are two words.

yA means "replace yA ".

iyas means "with iy ".

Shouldn't those two ordinarily mean "replace iy with yA ", by SaSThIsthAney...?

They might, but here they don't.

This iya is iy , with an extra FEOP a , and then /su.

The yA too has first ending — rule SaSThIsthAney... says the word meaning the original MAY have sixth in sUtras, not that it MUST.