ABSTRACT
United States Supreme Court justice Potter Stewart famously observed
in 1964 that, although he was unable to provide a precise definition of
pornography, “I know it when I see it.” We would say the same is true
for experimental mathematics. Nevertheless, we realize that we owe our
readers at least an approximate initial definition (of experimental mathe-
matics, that is; you’re on your own for pornography) to get started with,
and here it is.