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Elements of Partial Differential Equations Pavel Drábek / Gabriela Holubová ISBN: 978-3-11-031665-0 © 2014 Walter de Gruyter GmbH, Berlin/Boston Abbildungsübersicht / List of Figures Tabellenübersicht / List of Tables
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Elements of Partial Differential EquationsPavel Drábek / Gabriela Holubová ISBN: 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

Abbildungsübersicht / List of Figures

Tabellenübersicht / List of Tables

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

2

Figure 1.1. An isolated tube with cross-section A; the quantities considered change only in the direction of the x-axis.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

3

Figure 1.2. Traveling wave.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

4

Figure 1.3. String segment.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

5

Figure 1.4. Vibrating membrane over the subdomain Ω.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

6

Figure 3.1. Characteristic lines.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

7

Figure 3.2. Solution from Example 3.1.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

8

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

9

Figure 3.4. Solution of ut +3ux = 0, u(x, 0) = sin x.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

10

Figure 3.5. Transformation of the coordinate system.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

11

Figure 3.6. Vector field v = (1, y).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

12

Figure 3.7. Characteristics of the equation ux + 2xy2uy = 0.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

13

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

14

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

15

Figure 3.9. Solution of the problem ux + uy = 0, u(cos s, sin s) = s, s [0, π/2].∈

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

16

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

17

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

18

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

19

Figure 3.13. Solution of the problem ut + 2ux = −3u, u(x, 0) = 1/(1 + x2).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

20

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

21

Figure 4.1. Standing waves – a solution of the initial value problem (4.9) with c = 4.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

22

Figure 4.2. Solution of Example 4.4 on particular time levels.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

23

Figure 4.3. Graph of solution from Example 4.4 for c = 2, b = 1, a = 2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

24

Figure 4.4. Solution of Example 4.5 on particular time levels.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

25

Figure 4.5. Graph of solution from Example 4.5 for c = 2.3, a = 1.3.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

26

Figure 4.6. Domain of influence of the point (x0, 0) at time t ≥ 0.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

27

Figure 4.7. Domain of influence of the interval (−R, R) at time t ≥ 0.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 4.8. Domain of dependence (characteristic triangle) of the point (x, t).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

29

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

30

Figure 4.9. Characteristic triangle of the point (x0, t0).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

31

Figure 4.10. Solution of problem (4.19).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

32

Figure 5.1. Temperature profile on several time levels for a step initial temperature.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

33

Figure 5.2. Fundamental solution of the diffusion equation (here, with the choice k = 0.5).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

34

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

35

Figure 5.3. Solution of Example 5.4 with k = 2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

37

Figure 6.1. Polar coordinates r and θ.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

38

Figure 7.1. The odd extension.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

39

Figure 7.2. Solution of problem (7.5) with k = 1.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

40

Figure 7.3. Reflection method for the wave equation.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

41

Figure 7.4. Solution of problem (7.10) for c = 2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

42

Figure 7.5. Solution of problem (7.11) for c = 4.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

43

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 7.6. Reflection method for the wave equation on finite interval.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

45

Figure 7.7. Graphic illustration of the solution of problem (7.26).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

46

Figure 7.8. Graphic illustration of the solution of Example 7.8.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

47

Figure 7.9. Graphic illustration of the solution of problem (7.38).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

48

Figure 7.10. Schematic illustration of problem (7.39).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

49

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

50

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

51

Figure 7.12. Graphic illustration of the solution u(x, t) of problem (7.39) for h = 1, k = 1.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

52

Figure 8.1. The rectangle R and boundary conditions of (8.1).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

53

Figure 8.2. Decomposition of the nonhomogeneous boundary value problem for the Laplace equation on a rectangle.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

54

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

55

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

56

Figure 9.1. A string falling due to the gravitation.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

57

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

58

Figure 10.1. Domain of influence of the point (x0, 0) and domain of dependence of the point (x, t).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

59

Figure 10.2. Trapezoid of characteristic triangle.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

61

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

62

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

63

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

65

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

66

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

67

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

68

Figure 10.4. Covering of Ω by circular neighborhoods.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

69

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

70

Figure 10.5. Point (x, y) and its “neighbors”.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

71

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 11.1. Spherical coordinates.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

74

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

76

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

77

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

79

Figure 11.2. Half-space and reflection method.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

80

Figure 11.3. Verification of the property (ii) of Green’s function.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

81

Figure 11.4. Ball Ω and spherical inversion.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

82

Figure 11.5. Congruent triangles and the proportionality of ρ and ρ .∗

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 12.1. Graphic illustration of the solution of the initial boundary value problem (12.11) with constant initial condition on

time levels t = 0, 0.01, 0.04, 0.09.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

85

Figure 12.2. Graphic illustration of the solution of the initial boundary value problem (12.15) with initial condition (12.16) on

time levels t = 0, 0.01, 0.04, 0.09.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

86

Figure 12.3. Space-time cylinder Ω X [0, T].

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

87

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

88

Figure 13.1. “Hammer blow” in one, two and three dimensions.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.3. Solid cone frustum F.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.4. Initial condition (13.23) with the choice a = 2, b = 3.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.5. Graphic illustration of the solution of the initial boundary value problem (13.22) for the data c = 3, a = 2, b = 3,

on time levels t = 0, 0.2, 0.4, 0.8.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

94

Figure 13.6. The initial displacement (13.29).

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

95

Figure 13.7. Graphic illustration of the solution of the initial boundary value problem (13.27) with initial condition (13.29) on

time levels t = 0, 0.4, 0.8, 1.2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.8. Graphic illustration of the solution of the initial boundary value problem (13.30) with initial condition (13.33) on

time levels t = 0, 0.4, 0.8, 1.2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.9. Graphic illustration of the solution of the initial boundary value problem (13.39) (symmetric vibrations in a unit

ball) with initial condition (13.42) – dependence on r and t.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.10. Graphic illustration of the solution of the initial boundary value problem (13.27) (symmetric vibrations in a unit

disc) with initial condition (13.42) – dependence on r and t.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

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Figure 13.11. Radially symmetric solutions of the Dirichlet

problem for the wave equation in a disc (2D) and in a ball

(3D) with the initial condition ψ(r) = 1 for 0 ≤ r ≤ 1 and zero

otherwise.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

100

Figure B.1. Bessel functions of the first kind for n = 0, 1, 2.

Elements of Partial Differential Equations, Pavel Drábek / Gabriela Holubová ISBN 978-3-11-031665-0

© 2014 Walter de Gruyter GmbH, Berlin/Boston

101

Figure B.2. Bessel functions of the second kind for n = 0, 1, 2.


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