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Estimation of the conductivity in the one-phase Stefan problem: Basic results. (English) Zbl 0848.35140

This paper is concerned with establishing an existence and uniqueness theory and a priori estimates for the problem of finding \(u\) in the Stefan problem; \[ u_t= a(t) u_{xx},\quad a(t) u_x(0, t)= g(t),\quad 0< x< s(t),\quad 0< t\leq T, \]
\[ u(s(t), t)= f(t),\quad 0\leq t\leq T,\quad u(x, 0)= \vartheta(x),\quad 0\leq x\leq b,\;b> 0 \] for a given \(a(t)\). For a given boundary function \(s\) the problem is shown to reduce to an equivalent system of integral equations. Based on those integral equations a fixed point argument is used to prove the existence of a unique solution.

MSC:

35R30 Inverse problems for PDEs
35R35 Free boundary problems for PDEs
80A22 Stefan problems, phase changes, etc.
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