Partial Differential Equations

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Springer Science & Business Media, Aug 12, 2002 - Mathematics - 325 pages
This textbook is intended for students who wish to obtain an introduction to the theory of partial di?erential equations (PDEs, for short), in particular, those of elliptic type. Thus, it does not o?er a comprehensive overview of the whole ?eld of PDEs, but tries to lead the reader to the most important methods and central results in the case of elliptic PDEs. The guiding qu- tion is how one can ?nd a solution of such a PDE. Such a solution will, of course, depend on given constraints and, in turn, if the constraints are of the appropriate type, be uniquely determined by them. We shall pursue a number of strategies for ?nding a solution of a PDE; they can be informally characterized as follows: (0) Write down an explicit formula for the solution in terms of the given data (constraints). This may seem like the best and most natural approach, but this is possible only in rather particular and special cases. Also, such a formula may be rather complicated, so that it is not very helpful for detecting qualitative properties of a solution. Therefore, mathematical analysis has developed other, more powerful, approaches. (1) Solve a sequence of auxiliary problems that approximate the given one, and show that their solutions converge to a solution of that original pr- lem. Di?erential equations are posed in spaces of functions, and those spaces are of in?nite dimension.
 

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Contents

III
7
IV
15
V
31
VII
37
VIII
42
IX
51
X
60
XI
64
XXVI
172
XXVII
175
XXVIII
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XXIX
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XXX
208
XXXI
215
XXXII
223
XXXIII
229

XII
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XIII
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XIV
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XV
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XVI
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XVII
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XVIII
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XIX
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XX
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XXI
129
XXII
145
XXIII
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XXIV
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XXV
170
XXXIV
243
XXXV
248
XXXVI
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XXXVII
263
XXXVIII
269
XXXIX
275
XL
287
XLI
291
XLII
309
XLIII
317
XLIV
319
XLV
323
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