An Interference Head Wave (Buldyrev Wave) and the Locality Principle

In a series of articles, V. S. Buldyrev considered interference head waves, called now Buldyrev waves. The main goal in the present paper is to obtain formulas describing Buldyrev waves using the locality principle. Similar formulas have been deduced (from other but also heuristic considerations) by Buldyrev earlier. A different point of view on the Buldyrev wave is described by V. M. Babich. Some formulas for waves of this class contain an illusory contradiction with the concept of locality. It is demonstrated that the contradiction is fictitious and the formulas deduced by Buldyrev and the results obtained later perfectly agree with the locality principle.