"Tychomancy" meaning the divination of chances presents a set of
rules for inferring the physical probabilities of outcomes from the
causal or dynamic properties of the systems that produce them.
Probabilities revealed by the rules are wide-ranging: they include
the probability of getting a 5 on a die roll, the probability
distributions found in statistical physics, and the probabilities
that underlie many prima facie judgments about fitness in
evolutionary biology.
Michael Strevens makes three claims about the rules. First, they
are reliable. Second, they are known, though not fully consciously,
to all human beings: they constitute a key part of the physical
intuition that allows us to navigate around the world safely in the
absence of formal scientific knowledge. Third, they have played a
crucial but unrecognized role in several major scientific
innovations.
A large part of "Tychomancy" is devoted to this historical role
for probability inference rules. Strevens first analyzes James
Clerk Maxwell s extraordinary, apparently a priori, deduction of
the molecular velocity distribution in gases, which launched
statistical physics. Maxwell did not derive his distribution from
logic alone, Strevens proposes, but rather from probabilistic
knowledge common to all human beings, even infants as young as six
months old. Strevens then turns to Darwin s theory of natural
selection, the statistics of measurement, and the creation of
models of complex systems, contending in each case that these
elements of science could not have emerged when or how they did
without the ability to eyeball the values of physical
probabilities."
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