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4.1  Basic  Concepts. Classification of Linear Differential
                                 Equations…………………………………………….....……..61
                                     4.2  Linear  Dependence  and  Linear  Independence  of
                                 Systems of Functions…………………………………….........62
                                     4.3 Linear  Homogeneous  Differential  Equations…........64
                                     4.3.1 Wronski-Determinante………………………..……64
                                     4.3.2  Structure  of Common Decision of LHDE………...67
                                     4.4 Linear  Heterogeneous  Differential Equations……....70
                                     4.4.1  Structure  of  Common  Decision  of  Linear
                                 Heterogeneous Differential Equation………………………....70

                                     Lecture  5  Solving  of  Homogeneous  Linear  Differential
                                 Equations (LHDE) with Constant Coefficients……………….74

                                     5.1  Linear  homogeneous  differential  Equations  with
                                 Constant Coefficients………………………………………....74

                                     5.1.1 Characteristic Equation………………………….…74
                                     5.1.2  The  Roots  of  Characteristic  Equation  Real  and
                                 Simple………………………………………………………....75
                                     5.1.3  The  Roots  of  Characteristic  Equation  are  Real
                                 multiple………………………………………………….….…76
                                     5.1.4  The  roots  of  Characteristic  Equation  Are  Complex
                                 Conjugate…………………………………………………..….78
                                     5.1.5 The roots of Characteristic Equation are
                                  Arbitrary…………………………………………………..….80

                                     Lecture  6  Solving  of  Heterogeneous  Linear  Differential
                                 Equations (LNDE) With Constant Coefficients……………...83

                                     6.1  Method  of variation………………………………....83
                                     6.2 Linear Heterogeneous Differential Equations of the n-th
                                 Order With Constant Coefficients and Special Type of the Right
                                 Part……………………………………………………………87
                                     6.3  Linear  Heterogeneous  Differential  Equations  of  the
                                 Second Order With Constant Coefficients…………………....93
                                     6.4 Principle of superposition of decisions……………....98


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