deriv SD cv (245) ashtadhyayi.com hei.de L 245 ETT STT a 1.1.28 ALPH OLDHOMEPAGE NEWHOMEPAGE

vibhASA dik;samAse bahuvrIhau

विभाषा दिक्समासे बहुव्रीहौ ONPANINI 11028

(The sarvaclass are) optionally (pronouns) in a /bahuvrIhi compasspoint-compound.

Anticipated exception to nabahuvrIhau >.

When uttara-pUrvA- उत्तरॱपूर्वाॱ f means "northeastern", it is considered to be a /bahuvrIhi (even though there is no idea od possession involved, by rule zeSobahuvr... every compound is a /bahuvrIhi unless there is a rule that says that it is something else). So if we take the option in this sUtra, uttarapUrvA- उत्तरपूर्वाॱ gets pronoun endings —

uttarapUrvasyai उत्तरपूर्वस्यै "to what lies to the northeast", with syai स्यै by sarvanAmnassy...

but we may also use the normal endings —

uttarapUrvAyai उत्तरपूर्वायै by yADApaH

Why do we say "when the compound is a /bahuvrIhi".

When the compound is a /dvandva, this rule does not apply. And then, rule dvandveca >>> forbids the pronoun endings —

dakSiNottarapUrvANAm दक्षिणोत्तरपूर्वाणाम् "of the south, north and east", not pUrveSAm.