Съществувала ли е палатална съгласна с в старобългарски?
Did a Palatal Consonant s Exist in Old Bulgarian?

Summary/Abstract: It is generally thought that the consonant s in the pronouns сь and вьсь is palatal and this palatality is of equal quality. In fact the origin of s in these two words is different: in сь it derives from an i.e. k’ and in вьсь in the forms before *ai it is a result of the second regressive palatalization of x, generalized later in all other forms. In both cases the palatal quality of s does not represent a normal phonetical development. The s in the pronoun сь acts as palatal in Common Slavic because it is always followed by frontal vowels. The analogy between сь and вьсь, both having a stem in -s-, makes the declination of вьсь “palatal” also in the forms without *ai.

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