Hi,
say I have a reoccurance relation:

a_{t+1} = f(a_t)

and I want to try and solve it as a differential eq:

\frac { da_t }{ dt }\cong \frac { a_{ t+1 }-a_{ t } }{ \Delta t } =\frac { f(a_{ t })-a_{ t } }{ \Delta t } =...

What  \Delta t do I take? can I just use  \Delta t = 1 ..?

thank you