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MyWikiBiz, Author Your Legacy — Monday January 06, 2025
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{| align="center" cellpadding="0" cellspacing="0" style="border-left:1px solid black; border-top:1px solid black; border-right:1px solid black; border-bottom:1px solid black" width="90%"
Definition 2
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{| align="center" cellpadding="0" cellspacing="0" width="100%"
If X, Y c U,
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|- style="height:40px; text-align:center"
 
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| width="80%" | &nbsp;
then the following are equivalent:
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| width="20%" | <math>\text{Definition 2}\!</math>
 
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|}
D2a. X = Y.
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D2b. u C X  <=> u C Y, for all u C U.
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{| align="center" cellpadding="0" cellspacing="0" width="100%"
</pre>
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|- style="height:40px"
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| width="2%"  style="border-top:1px solid black" | &nbsp;
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| width="18%" style="border-top:1px solid black" | <math>\text{If}\!</math>
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| width="80%" style="border-top:1px solid black" | <math>P, Q ~\subseteq~ X</math>
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|- style="height:40px"
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| &nbsp;
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| <math>\text{then}\!</math>
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| <math>\text{the following are equivalent:}\!</math>
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|}
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|-
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|
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{| align="center" cellpadding="0" cellspacing="0" width="100%"
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|- style="height:40px"
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| width="2%"  style="border-top:1px solid black" | &nbsp;
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| width="18%" style="border-top:1px solid black" | <math>\operatorname{D2a.}</math>
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| width="60%" style="border-top:1px solid black" | <math>P ~=~ Q</math>
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| width="20%" style="border-top:1px solid black" | &nbsp;
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|- style="height:40px"
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| &nbsp;
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| <math>\operatorname{D2b.}</math>
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| <math>x \in P ~\Leftrightarrow~ x \in Q</math>
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| align="center" | <math>\forall x \in X</math>
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|}
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|}
    
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