A dynamical system can have discrete or continuous time.
The discrete case is defined by a map, z_1 = f(z_0), that gives the state
z_1 resulting from the initial state z_0 at the next time value. The continuous
case is defined by a "flow", z(t) = \phi_t(z_0), which gives the state
at time t, given that the state was z_0 at time 0. A smooth flow can be
differentiated w.r.t. time to give a differential equation, dz/dt = F(z).
In this case we call F(z) a "vector field," it gives a vector pointing in
the direction of the velocity at every point in phase space.
從非線性科學會的精華區借來，這是我所能找到，渾沌理論對時間的處理方式
這學期多補了財管,害我都沒時間去聽社課 -.-#
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