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    Tychonoff and Hausdorff Spaces

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    Let X and Y connected, locally path connected and Hausdorff. let X be compact.
    Let f: X ---> Y be a local homeomorphism. Prove that f is a surjective covering with finite
    fibers.

    Prove:
    a) Any subspace of a weak Hausdorff space is weak Hausdorff.
    b)Any open subset U of a compactly generated space X is compactly generated if each point
    has an open neighborhood in X with closure contained in U.
    c)Show that a space is Tychonoff iff it can be embedded in a cube.
    d) There are Tychonoff spaces that are not k-spaces, but every cube is a compact Hausdorff space.

    © BrainMass Inc. brainmass.com March 4, 2021, 7:13 pm ad1c9bdddf
    https://brainmass.com/math/geometry-and-topology/tychonoff-hausdorff-spaces-88734

    Solution Preview

    For each x in X we denote by H(x) an open set of X, containing x, such that
    f[H(x)] is open and f:H(x) --> f[H(x)] is a homeomorphism.
    These exist by f being a local homeomorphism.

    Note that f is an open map, so that f[X] is (non-empty) open in Y.
    Also, X is compact, so f[X] is a compact subset of the Hausdorff space Y,
    so f[X] is closed. But in a connected space, the only non-empty closed-and-open set is Y.
    So f[X] = Y and ...

    Solution Summary

    Tychonoff and Hausdorff Spaces are investigated. The solution is detailed and well presented.

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