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But to strike fear in the heart of any reasonably rigorous educator,
as I believe David to be, I will now proceed to mangle the pristine
description he gave, while retaining some unrecognizable fragment
of the sentiment, possibly so as to ridicule it?
I start with a vector of mass flow rate spatially extended along a
riparian boundary. I specify a local mass density at some point in
an infinity of locations in the flux. The quotient represents a
volumetric flow rate which would ordinarily be expressed in terms of
volume per time.
I take a particle of volume so small that it has
no spatial extension, and proclaim that when this particle passes a
bounding surface, no time has elapsed.
Did I get the general idea? :-)