I am a beginner Mustachian, so apologies if this has been asked many times over... How does inflation factor into this equation?:

# of years to retirement = ((annual expenses/withdrawal rate) - net worth)/(income after taxes * savings rate)

Is it just that inflation is in the numerator and denominator such that it cancels out? So that's assuming your income, annual expenses, and net worth grow with inflation? (Well, obviously your net worth is going to grow at a higher rate than inflation, but you know what I mean...)