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Open Halfspace

Last updated Nov 1, 2022

# Definition

Let VV be an Inner Product Space

Inner Product Space

Definition Suppose VV is a with ,,\langle \cdot, \cdot, \rangle. Then (V,,)(V, \langle \cdot, \cdot \rangle) is an ....

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over R\mathbb{R}. An Open Halfspace

Open Halfspace

Definition Let VV be an over R\mathbb{R}. An is a of the form $$H = \{x : \langle x,...

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is a Set of the form H=x:x,a>bH = {x : \langle x, a \rangle > b} for any aVa \in V and bRb \in \mathbb{R}.

# Remarks

  1. An Open Halfspace

    Open Halfspace

    Definition Let VV be an over R\mathbb{R}. An is a of the form $$H = \{x : \langle x,...

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    is Open

    Open

    Definition Suppose (X,τ)(X, \tau) is a . Then UXU \subset X is if UτU \in \tau....

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    . TODO

    TODO

    ...

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    - prove this.
  2. If HH is an Open Halfspace

    Open Halfspace

    Definition Let VV be an over R\mathbb{R}. An is a of the form $$H = \{x : \langle x,...

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    , then clH\text{cl} H is a Closed Halfspace

    Closed Halfspace

    Definition Let VV be an over R\mathbb{R}. A is a of the form $$H = \{x : \langle x,...

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    - TODO

    TODO

    ...

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    prove this.
  3. The Boundary

    Boundary

    Definition Let XX be a and let SXS \subset X. Then the of SS, denoted bdS\text{bd}S, is the $$\text{bd}S...

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    of a Closed Halfspace

    Closed Halfspace

    Definition Let VV be an over R\mathbb{R}. A is a of the form $$H = \{x : \langle x,...

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    is a Hyperplane

    Hyperplane

    Definition Let VV be an over R\mathbb{R}. A is a of the form $$H = \{x : \langle x,...

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    - TODO

    TODO

    ...

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    prove this.

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