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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 2017-11-21 04:30:10

Nehushtan
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Closures, interiors, and boundaries




Last edited by Nehushtan (2017-11-21 06:14:52)


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#2 2017-11-21 04:46:42

Nehushtan
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Re: Closures, interiors, and boundaries

Last edited by Nehushtan (2017-11-21 06:15:27)


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#3 2017-11-21 06:13:39

Nehushtan
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Re: Closures, interiors, and boundaries












Last edited by Nehushtan (2017-11-22 11:21:31)


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#4 2017-11-24 10:58:27

Alg Num Theory
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Re: Closures, interiors, and boundaries

Nehushtan wrote:

Here is an interesting example:

Last edited by Alg Num Theory (2017-12-11 22:34:20)

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