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Dictionary entry of the hour:
face of simplex
    topology:
    Let `(:v_0,..., v_k:)` be a simplex. Any subset of set of points `{v_0,..., v_k}` is called the face of the simplex `(:v_0,..., v_k:)`.
    The faces of 1-simplex `(:v_0, v_1:)` are the 1-simplex itself, the endpoints `(:v_0:)` and `(:v_1:)` a...


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