By W. Eckhaus
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Additional info for Asymptotic Analysis of Singular Perturbations
Examples of such pathological behaviour, which fortunately does not often occur in applications, can be found in Eckhaus (1973). The local variables for which the local expansions are significant, are naturally of particular importance. 4. If a local approximation is a significant approximation, then the corresponding local variable is called a boundary layer variable. We now illustrate the definitions given above by some examples. 3 we have studied the function 42 MATCHING RELATIONS AND COMPOSITE EXPANSIONS @(X,E) = -5& + CH.
6. Gauge functions, gauge sets and the uniqueness of regular expansions In applications the order functions occurring in expansions are chosen as simple as possible. They usually are elements of one-parameter families of functions such as E P , (In 1 / ~ ) 4 , exp( - s / f ) , or products of such functions, where p , q and s can be any real number and CJ any positive number. These functions are called (elementary) gauge functions. Depending on the needs of the analysis one sometimes uses somewhat modified gauge functions, such as for example ( a + In l/s)q, q < O , where a is some constant.
In this section we shall formulate an additional and fundamental condition, called the overlap hypothesis, which in the sequel will assure the possibility of such a construction. In order to bring out matters clearly, we consider the one-dimensional situation, and suppose that @(x,E),x E [0,1] has a boundary layer at x = 0. For CH. 3, $2 FURTHER APPLICATIONS OF THE EXTENSION THEOREMS simplicity we assume first that there is just one boundary layer variable defined by 43 to, Generalizations of this simple case will be discussed at the end of this section.
Asymptotic Analysis of Singular Perturbations by W. Eckhaus