Summary |
The
Doomsday argument is a family of arguments about humanity’s likely
survival. There are mainly two versions of the argument discussed in
the literature, both of which appeal to a form of Copernican
principle (or principle of typicality or mediocrity). A first version
of the argument (endorsed by, e.g., John Leslie) dictates a
probability shift in favor of theories that predict earlier end dates
for our species assuming that we are a typical—rather than
atypical—member of that group.
The
other main version of the argument is sometimes referred to as the ‘delta-t
argument,’ and it has provoked both
outrage and genuine scientific interest. It claims to allow one to
make a prediction about the total duration of any process of
indefinite duration based only on the assumption that the moment of
observation is randomly selected. A variant of this argument, which
gives equivalent predictions, reasons in terms of one’s rank in a
sequential process. |