tive.                                                         f              i                              n                +                0                                      -                          f              i              n                                            Δ            ⁢                          xe0x00x00                        ⁢            t                          =                                            f                              i                +                0                            n                        -                          0              ⁢                              f                i                n                                      +                          f                              i                -                0                            n                                            Δ            ⁢                          xe0x00x00                        ⁢                          x              0                                                          (        0        )             