Abstract
(l.lh) 40) = 30, (l.li) where a,(u) > 0 and ai = 0 for i = 1,2. In the classical Stefan problem, the specific heat E(U) is required to be strictly positive, where a(u) = ml(u) if u is in Q,’ and ~~~(11) if u is in Q;. However, in more general free boundary problems various types of degeneracy in a can occur. In the electro-chemical machining process, the “specific heat” is zero in both phases resulting in elliptic differential equations, but with a Stefan type boundary condition. See [3] for a description of this model. In the study of saturated/unsaturated flow in
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