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HIGH ORDER GEOMETRIC SMOOTHNESS FOR CONSERVATION LAWS

    https://doi.org/10.1142/S021989160500035XCited by:0 (Source: Crossref)

    The smoothness of the solutions of 1D scalar conservation laws is investigated and it is shown that if the initial value has smoothness of order α in Lq with α > 1 and q = 1/α, this smoothness is preserved at any time t > 0 for the graph of the solution viewed as a function in a suitably rotated coordinate system. The precise notion of smoothness is expressed in terms of a scale of Besov spaces which also characterizes the functions that are approximated at rate N in the uniform norm by piecewise polynomials on N adaptive intervals. An important implication of this result is that a properly designed adaptive strategy should approximate the solution at the same rate N in the Hausdorff distance between the graphs.