“Costas Efthimiou is a University of Central Florida physics professor claims he has mathematic proof that the vampires–at least as they are depicted in legend–simply can’t exist. The logic goes something like this:
“On Jan 1, 1600, the human population was 536,870,911. If the first vampire came into existence that day and bit one person a month, there would have been two vampires by Feb. 1, 1600. A month later there would have been four, and so on. In just two-and-a-half years the original human population would all have become vampires with nobody left to feed on.”
I would appreciate, if you give your opinion for the inquiries below;
1) If the underlined part above is a subjunctive or not? I am thinking of ‘would have been’ above as a future of the past.
2) If that is a mixed conditional, then why the author chose the past tense in 'if-clause' instead of the past perfect one, since the time line has been clearly set as Jan. 1, 1600? I mean, the version - "If the first vampire had come into existence that day and bit one person a month, there would have been ... " would be fit to the mixed conditional.