This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Hemihypercube adjacency matrices.svg Adjacency matrices of the first five hyperhemicubes The matrix represents the hemicube with six edges They are adjacency matrices of the next smaller hypercube compare this adjacency matrix of the cube together with the antidiagonal which means that each hyperhemicube is the hypercube of the