2024-03-28T23:59:21Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/692692022-11-17T02:08:08Zhdl_2115_45007hdl_2115_116Viscosity solutions with shocksGiga, Y.open access410A solution of single nonlinear first order equations may develop jump discontinuities even if initial data is smooth. Typical examples include a crude model equation describing some bunching phenomena observed in epitaxial growth of crystals as well as conservation laws where jump discontinuities are called shocks. Conventional theory of viscosity solutions does not apply. We introduce a notion of proper (viscosity) solutions to track whole evolutions for such equations in multi-dimensional spaces. We establish several versions of comparison principles. We also study the vanishing viscosity method to construct a unique global proper solution at least when the evolution is monotone in time or the initial data is monotone in some sense under additional technical assumptions. In fact, we prove that the graph of approximate solutions converges to that of a proper solution in the Hausdorff distance topology. Such a convergence is also established for conservation laws with monotone data. In particular, local uniform convergence outside shocks is proved.Department of Mathematics, Hokkaido University2001-02engdepartmental bulletin paperVoRhttps://doi.org/10.14943/83665http://hdl.handle.net/2115/6926910.14943/83665Hokkaido University Preprint Series in Mathematics519158https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/69269/1/pre519.pdfapplication/pdf2.55 MB2001-02