\tau\lbrack 0\rbrack - k \cdot \{ R_{0}(\tau\lbrack 0\rbrack - \frac{0}{0}) - R_{0}(\tau\lbrack 0\rbrack + \frac{0}{0})\}} \\ {\text{                                                                            }.} \\ {\text{                                                                            }.} \\ {\text{                                                                            }.} \\ {\t