Changes

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:: <math>\overline{\underline{(}} \ldots \overline{\underline{)}}</math>
 
:: <math>\overline{\underline{(}} \ldots \overline{\underline{)}}</math>
 +
 +
{| align="center" cellpadding="8" width="90%"
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|
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<math>\begin{array}{lllll}
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{}^{_\sim}\!X
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& = &
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U - X
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& = &
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\{ \, u \in U : \underline{(} u \in X \underline{)} \, \}.
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\end{array}</math>
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|}
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{| align="center" cellpadding="8" width="90%"
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|
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<math>\begin{array}{lllll}
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{}^{_\sim}\!X
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& = &
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U - X
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& = &
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\{ \, u \in U : \tilde{(} u \in X \tilde{)} \, \}.
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\end{array}</math>
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|}
    
:: <math>X = \{\ (\!|u|\!)(\!|v|\!),\ (\!|u|\!) v,\ u (\!|v|\!),\ u v\ \} \cong \mathbb{B}^2.</math>
 
:: <math>X = \{\ (\!|u|\!)(\!|v|\!),\ (\!|u|\!) v,\ u (\!|v|\!),\ u v\ \} \cong \mathbb{B}^2.</math>
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