Hyper-volume.
>How many gallons of water does it take to fill up a:
>
>*hypercube
You're asking the wrong question. Hopefully, the following analogy will
make this clear to you.
Let's start with one dimension: a line segment. You can measure its
length in meters (or yards if that's what turns your crank). Pretty
straight-forward.
Now, we'll jump up from one dimension to two dimensions. We'll move
that line segment sideways, so that it sweeps out a square, which is
a nice, simple, two-dimensional figure. Asking "how long is a square?"
isn't really a meaningful question. There are some lengths associated
with a square, such as the length of an edge (side), the length of a
diagonal, or the length of its perimeter.
Asking "how long a piece of string does it take for a square?" doesn't
make sense. What might make sense in its place would be "how big a piece
of paper does it take to cover a square?" would make sense. That is, of
course, the *area* of a square.
Now, we'll move the square parallel to itself, so that it sweeps out
a cube. This bumps us up to three dimensions. A cube, like a square,
has some lengths associated with it: edge, diagonal of a face, diagonal
of the cube. It also has some areas associated with it. Primary among
these are the area of a single face, and the area of its entire surface.
So, "how long a piece of string does a cube take?" and "how big a piece
of paper does a cube take?" aren't really useful questions. But, one
could meaningfully ask "how much water does it take to fill a cube?"
Going from three to four dimensions is a little bit tricky, since we
can't visualize moving a cube parallel to itself in all three dimensions.
But, even if we can't see it, we can reason about it.
A hypercube is going to have many lengths and areas associated with it.
So, we can't ask "how long a piece of string?" or "how big a piece of
paper?" It's also going to have different volumes, so we can't really
answer a question like "how many gallons of water?"
What it does have that's unambiguous is its hypervolume. A line with
length s obviously has a length of s. A square with edges of length
s will have an area of s^2 (s squared). A cube with edges of length
s will have a volume of s^3. A hypercube with edges of length s will
have a hypervolume of _______.
For your further amusement:
A point has 1 vertex (because it *is* a vertex).
A line segment has 1 edge (because it is an edge) and 2 vertices
(its endpoints).
A square has 1 face (because it is a face), 4 edges (its sides), and
4 vertices (its corners).
A cube has 1 volume, 6 faces (look at a die), 12 edges, and 8 vertices.
A hypercube has:
___ hypervolumes
___ volumes
___ faces
___ edges
___ vertices
(It might help to arrange this all in a table.)
--
Michael F. Stemper
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