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L<sup>2</sup>ESTIMATES FOR THE EIGENFUNCTIONS CORRESPONDING TO REAL EIGENVALUES OF THE TRICOMI OPERATOR
We introduce a family [Formula: see text] of normal Tricomi domains Ω α,β , α > 0 > β, and we show that its elements are D-star-shaped with respect to the vector field D = -3x∂ x - 2y∂ y if and only if α ≥ 1/2. Provided that the …