07/14/2014, 12:55 AM

We know the logarithmic derivative is f ' / f dz.

We know the solve derivative is dz / ( f ' (inv f) ).

Let f = exp^[0.5].

Then solve f = inv f = ln(f).

THUS f ' / f = 1 / ( f ' (ln(f)) )

I wonder how good approximations of f satisfy the differential equation. (2sinh , base change , fake etc )

What about theta(z) ??

regards

tommy1729

We know the solve derivative is dz / ( f ' (inv f) ).

Let f = exp^[0.5].

Then solve f = inv f = ln(f).

THUS f ' / f = 1 / ( f ' (ln(f)) )

I wonder how good approximations of f satisfy the differential equation. (2sinh , base change , fake etc )

What about theta(z) ??

regards

tommy1729