volume is .

Faces

Every hypercube admits, as its faces, hypercubes of a lower dimension contained in its boundary. A hypercube of dimension admits facets, or faces of dimension : a (-dimensional) line segment has endpoints; a (-dimensional) square has sides or edges; a -dimensional cube has square faces; a (-dimensional) tesseract has three-dimensional cubes as its facets. The number of vertices of a hypercube of dimension is (a usual, -dimensional cube has vertices, for instance).

The number of the -dimensional

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