The problem of the number of rows in the guttural language of Indo-European

The problem of the number of rows in the guttural language PIE  - a scientific problem that arose in the 70s of the XIX century. For a long time scientists could not reach consensus on a number of reconstructed for PIE language series velar .

Believes that in the proto-language was three rows back consonants: palatovelyarny, velar clean labiovelar. This situation takes G. Ascoli , K. Brugman , A. LESQUIN , O. Semereni , F. Fortunatov F. , S. K. Bulich , A. I. Sobolewski , I. Tronsky M. , T. Gamkrelidze , Vyacheslav. Sun Ivanov and others.

A. Meyer , G. Hirt , B. A. The Virgin , V. K. Zhuravlev , A. N. Savchenko recognize only clean and labiovelar velar series, claiming that evolved into palatalized satemnyh second languages. E. Kurilovich and H. Reichelt, in contrast, only accept the existence of palatalized velars and standing on what evolved into labiovelar kentumnyh second languages.

Posits only one row back consonants, different splitting in kentumnyh satemnyh and languages. This concept adhere S. Mladenov and J. Safarevich .

Strictly speaking, the various hypotheses are not mutually exclusive. They may reflect different evolutionary state PIE language. Therefore, a more precise formulation of the question is about the number of rows guttural immediately before the collapse of the Indo-European linguistic unity.

Currently recognized three-row is a hypothesis that has been proven to material Albanian , Luwian and Sanskrit . Albanian preserved traces of all three rows back consonants