We will suppose that f(0) has an angle point of opening 28, 8 € (0, 7/2), and the ... (12], B.V. Bazaliy and A. Friedman [3], and G. Prokert (19] by various ... the case of smooth initial data, it was proved by B.V. Bazaliy [2], X. Chen, ..... boundary conditions on the fixed boundaries I'i] = '1x [0,T}, 127 = 12x [0, T] .... 3x2 + x3 = Foi.
