- Population: XXXOOOOVVV - First 3 are the weakest. (X) - Last 3 are the fittest. (V) - Middle ones are normal. (O) When you say "survival of the f

- Population: XXXOOOOVVV - First 3 are the weakest. (X) - Last 3 are the fittest. (V) - Middle ones are normal. (O) When you say "survival of the fittest" you mean that only the 3 VVV survives and the other 7 OOOOVVV die. When you say "death to the weakest" you mean that the 3 XXX die, therefore the other 7 OOOOVVV survive. When you say "not survival of the not-fit" (I suppose you say the fittest) you mean: - Let's take the non-fittest (XXXOOOO) - Not survive of them. Therefore you mean the death of 7 XXXOOOO and the survival of 3 VVV. So you are right that "survival of the fittest" = "not survival of the not-fit". But "survival of the fittest" (VVV survives) is not equal to "death to the weakest" (OOOOVVV) because VVV != OOOOVVV.