Halfway through writing my response to Andukar, I noticed the appearance of Anark's writeup, which says most of what I was thinking, and more clearly than I could have put it.
I'd have to disagree with Andukar's statement "it is math nonetheless". Mathematics
and physics describe the world, but they aren't actually the world.

Take as an example an equation describing the y-component of projectile motion in two
dimensions:

v_{y} = v_{0} sin θ + a_{y}t

If someone were to fire a

projectile, its motion will, in fact, be precisely

predicted by
that equation.

^{1} But is the projectile actually

**using** the equation to
move? Is the

universe itself actually

running numbers through equations to determine what
it will do next? Clearly not, as this would require an endless stack of places-to-run-the-numbers, which themselves would have to operate on such rules. (cf.

Douglas Hofstadter)

##### The equations *describe* the events of the universe; they do not *specify*
the events.

^{1}With the usual caveats about air resistance, relativistic speeds, external
forces, etc., which are not relevant to the discussion.