In this paper we communicate recent developments in theory, experiment, and
computer simulations of V-shaped waves in excitable media. The waves appea
r as the result of oblique collisions of two plane waves, and constitute a
one-parametric family of V-like patterns distinguishable by the angle of co
llision. The shape and position of V-patterns are stable with respect to lo
calized perturbations of the front line and to some global perturbations of
the medium. V-waves survive collisions with target patterns and spirals. V
-patterns are a convenient tool for experimental study of the velocity-curv
ature dependence for wave fronts-one of the major pattern-forming factors i
n excitable media. V-waves are an important building block for constructing
wave patterns in layered excitable media. (C) 1999 Elsevier Science Ltd. A
ll rights reserved.