Abstract
In this note we give a survey on recent developments in the regularity of free boundaries of obstacle type in absence of the obstacle, giving rise to solutions that may change sign. The focus is on two techniques, the monotonicity formulas and global versus local analysis.
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Shahgholian, H. (2001). The Impact of Monotonicity Formulas in Regularity of Free Boundaries. In: Casacuberta, C., Miró-Roig, R.M., Verdera, J., Xambó-Descamps, S. (eds) European Congress of Mathematics. Progress in Mathematics, vol 202. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8266-8_27
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DOI: https://doi.org/10.1007/978-3-0348-8266-8_27
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