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Ivšić's law or Stang's law is a Common Slavic accent law named after Stjepan Ivšić and Christian Schweigaard Stang, who both independently discovered it. It explains the origin of the so-called Proto-Slavic neoacute accent occurring in the accent paradigm ''b'' as retractive from the following syllable. It was independently discovered by Ivšić in 1911, and 46 years later by Stang. ==Retraction from stressed weak yer== During the Late Common Slavic period, the short vowels *ь and *ъ (known as yers, also written *ĭ *ŭ) developed into "strong" and "weak" variants according to Havlík's law. The accented weak variants could no longer carry an accent which was thus retracted onto the preceding syllable. That syllable gained a rising ''neoacute'' accent. It is denoted with a tilde diacritic (unicode:⟨◌̃⟩) on historically "long" syllables ( *a, *i, *u, *y, *ě, *ę, *ǫ, *VR), and with a grave accent (unicode:⟨◌̀⟩) on a historically "short" syllables ( *e, *o, *ь, *ъ). In conservative Serbo-Croatian dialects of Čakavian and Old Štokavian (e.g. Slavonian) this neoacute is preserved as a separate tone, distinct from the old acute and circumflex. Ivšić designated the long neoacute in Čakavian with the same circumflex symbol as the Lithuanian circumflex, due to their phonetic similarity. Compare: * PSl. (unicode: *pirstu̍ ) > Common Slavic (unicode: *pьrstъ̍ ) > (unicode: *pь̃rstъ) (Čakavian ''(unicode:pr̃st)'', Russian ''pérst'', N pl ''perstí'') 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ivšić's law」の詳細全文を読む スポンサード リンク
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