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Nonlinear Differential Equation Models
We give a new proof of the fact that the free boundary for the obstacle problem in two dimensions satisfies a natural and sharp inner ball condition. 2000 Mathematics Subject Classification: 35R35; 26A51, 52A55doi:10.1007/978-3-7091-0609-9_1 fatcat:ypzwmuhmcjh5vfj3cvddzhpljy