Introduction |
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1 | (4) |
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5 | (24) |
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1.1 Definition of bicomplex numbers |
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5 | (2) |
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1.2 Versatility of different writings of bicomplex numbers |
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7 | (1) |
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1.3 Conjugations of bicomplex numbers |
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8 | (1) |
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1.4 Moduli of bicomplex numbers |
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9 | (3) |
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1.4.1 The Euclidean norm of a bicomplex number |
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11 | (1) |
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1.5 Invertibility and zero-divisors in BC |
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12 | (3) |
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1.6 Idempotent representations of bicomplex numbers |
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15 | (5) |
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1.7 Hyperbolic numbers inside bicomplex numbers |
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20 | (5) |
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1.7.1 The idempotent representation of hyperbolic numbers |
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23 | (2) |
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1.8 The Euclidean norm and the product of bicomplex numbers |
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25 | (4) |
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2 Algebraic Structures of the Set of Bicomplex Numbers |
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29 | (22) |
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2.1 The ring of bicomplex numbers |
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29 | (1) |
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2.2 Linear spaces and modules in BC |
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30 | (3) |
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2.3 Algebra structures in BC |
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33 | (2) |
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2.4 Matrix representations of bicomplex numbers |
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35 | (2) |
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2.5 Bilinear forms and inner products |
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37 | (4) |
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2.6 A partial order on the set of hyperbolic numbers |
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41 | (6) |
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2.6.1 Definition of the partial order |
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41 | (1) |
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2.6.2 Properties of the partial order |
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42 | (2) |
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2.6.3 B-bounded subsets in D |
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44 | (3) |
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2.7 The hyperbolic norm on BC |
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47 | (4) |
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2.7.1 Multiplicative groups of hyperbolic and bicomplex numbers |
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48 | (3) |
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3 Geometry and Trigonometric Representations of Bicomplex Numbers |
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51 | (22) |
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3.1 Drawing and thinking in R4 |
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52 | (5) |
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3.2 Trigonometric representation in complex terms |
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57 | (5) |
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3.3 Trigonometric representation in hyperbolic terms |
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62 | (11) |
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3.3.1 Algebraic properties of the trigonometric representation of bicomplex numbers in hyperbolic terms |
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65 | (3) |
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3.3.2 A geometric interpretation of the hyperbolic trigonometric representation |
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68 | (5) |
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73 | (34) |
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73 | (15) |
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4.1.1 Real lines in the complex plane |
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73 | (4) |
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77 | (1) |
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4.1.3 Complex lines in BC |
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77 | (1) |
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4.1.4 Parametric representation of complex lines |
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78 | (3) |
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4.1.5 More properties of complex lines |
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81 | (2) |
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4.1.6 Slope of complex lines |
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83 | (3) |
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4.1.7 Complex lines and complex arguments of bicomplex numbers |
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86 | (2) |
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4.2 Hyperbolic lines in BC |
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88 | (7) |
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4.2.1 Parametric representation of hyperbolic lines |
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91 | (1) |
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4.2.2 More properties of hyperbolic lines |
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92 | (3) |
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4.3 Hyperbolic and Complex Curves in BC |
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95 | (6) |
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95 | (2) |
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4.3.2 Hyperbolic tangent lines to a hyperbolic curve |
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97 | (1) |
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4.3.3 Hyperbolic angle between hyperbolic curves |
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97 | (1) |
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98 | (3) |
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4.4 Bicomplex spheres and balls of hyperbolic radius |
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101 | (1) |
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4.5 Multiplicative groups of bicomplex spheres |
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102 | (5) |
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107 | (6) |
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107 | (3) |
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5.2 The Euclidean topology on BC |
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110 | (1) |
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110 | (3) |
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6 Elementary Bicomplex Functions |
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113 | (22) |
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6.1 Polynomials of a bicomplex variable |
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113 | (5) |
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6.1.1 Complex and real polynomials |
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113 | (1) |
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6.1.2 Bicomplex polynomials |
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114 | (4) |
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6.2 Exponential functions |
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118 | (5) |
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6.2.1 The real and complex exponential functions |
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118 | (1) |
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6.2.2 The bicomplex exponential function |
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119 | (4) |
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6.3 Trigonometric and hyperbolic functions of a bicomplex variable |
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123 | (5) |
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6.3.1 Complex Trigonometric Functions |
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123 | (1) |
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6.3.2 Bicomplex Trigonometric Functions |
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124 | (3) |
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6.3.3 Hyperbolic functions of a bicomplex variable |
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127 | (1) |
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128 | (1) |
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6.5 The bicomplex logarithm |
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128 | (3) |
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6.5.1 The real and complex logarithmic functions |
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128 | (1) |
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6.5.2 The logarithm of a bicomplex number |
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129 | (2) |
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6.6 On bicomplex inverse trigonometric functions |
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131 | (1) |
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6.7 The exponential representations of bicomplex numbers |
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131 | (4) |
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7 Bicomplex Derivability and Differentiability |
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135 | (44) |
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7.1 Different kinds of partial derivatives |
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135 | (2) |
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7.2 The bicomplex derivative and the bicomplex derivability |
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137 | (7) |
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7.3 Partial derivatives of bicomplex derivable functions |
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144 | (8) |
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7.4 Interplay between real differentiability and derivability of bicomplex functions |
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152 | (7) |
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7.4.1 Real differentiability in complex and hyperbolic terms |
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152 | (4) |
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7.4.2 Real differentiability in bicomplex terms |
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156 | (3) |
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7.5 Bicomplex holomorphy versus holomorphy in two (complex or hyperbolic) variables |
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159 | (3) |
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7.6 Bicomplex holomorphy: the idempotent representation |
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162 | (5) |
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7.7 Cartesian versus idempotent representations in BC-holomorphy |
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167 | (12) |
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8 Some Properties of Bicomplex Holomorphic Functions |
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179 | (14) |
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8.1 Zeros of bicomplex holomorphic functions |
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179 | (2) |
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8.2 When bicomplex holomorphic functions reduce to constants |
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181 | (4) |
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8.3 Relations among bicomplex, complex and hyperbolic holomorphies |
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185 | (1) |
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8.4 Bicomplex anti-holomorphies |
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186 | (2) |
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8.5 Geometric interpretation of the derivative |
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188 | (2) |
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8.6 Bicomplex Riemann Mapping Theorem |
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190 | (3) |
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9 Second Order Complex and Hyperbolic Differential Operators |
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193 | (8) |
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9.1 Holomorphic functions in C and harmonic functions in R2 |
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193 | (1) |
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9.2 Complex and hyperbolic Laplacians |
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194 | (3) |
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9.3 Complex and hyperbolic wave operators |
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197 | (1) |
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9.4 Conjugate (complex and hyperbolic) harmonic functions |
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198 | (3) |
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10 Sequences and Series of Bicomplex Functions |
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201 | (10) |
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10.1 Series of bicomplex numbers |
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201 | (1) |
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10.2 General properties of sequences and series of functions |
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202 | (2) |
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10.3 Convergent series of bicomplex functions |
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204 | (1) |
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10.4 Bicomplex power series |
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205 | (3) |
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10.5 Bicomplex Taylor Series |
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208 | (3) |
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11 Integral Formulas and Theorems |
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211 | (8) |
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11.1 Stokes' formula compatible with the bicomplex Cauchy--Riemann operators |
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211 | (3) |
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11.2 Bicomplex Borel--Pompeiu formula |
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214 | (5) |
Bibliography |
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219 | (7) |
Index |
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226 | |