1 ln P0 + (t - T0)P = Iln^ + (t - T0)dP/dt) (5.2.20)

or, eventually, ln

To evaluate (5.2.21) numerically for small values of dP/dt or in the limit dP/dt ^ 0, we provide the Taylor series expansion (5.2.22)

= (t - Tp) y. (-1)k /(t - T0) dP 0 P0 ¿0 k +1 V P0 dt

for small dP/dt, which in the limit dP/dt ^ 0 yields the phase-time relation

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