I'm struggling in my subject that has a component of maths in it, please help. I need to make $N_{t+1} = \lambda Nt$ become $\Delta N_{t\ \text{to}\ t+1} = RN_t$ showing working.
$N_{t+1}$ is the population size at time $t+1$.
$N_t$ is the population size at $t$.
$\lambda$ is a constant factor by which the population increases per time unit.
Thank you.