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| | ===Definition 2=== | | ===Definition 2=== |
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| − | <pre> | + | <br> |
| − | Definition 2
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| − | If X, Y c U,
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| − | | |
| − | then the following are equivalent:
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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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| − | </pre>
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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%" | | {| 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%" |
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| | {| align="center" cellpadding="0" cellspacing="0" width="100%" | | {| align="center" cellpadding="0" cellspacing="0" width="100%" |
| − | |- style="height:40px; text-align:right" | + | |- style="height:40px; text-align:center" |
| − | | width="98%" | <math>\text{Definition 2}\!</math> | + | | width="80%" | |
| − | | width="2%" |
| + | | width="20%" | <math>\text{Definition 2}\!</math> |
| | |} | | |} |
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| | | <math>\operatorname{D2b.}</math> | | | <math>\operatorname{D2b.}</math> |
| | | <math>x \in P ~\Leftrightarrow~ x \in Q</math> | | | <math>x \in P ~\Leftrightarrow~ x \in Q</math> |
| − | | align="cennter" | <math>(\forall x \in X)</math> | + | | align="center" | <math>\forall x \in X</math> |
| | |} | | |} |
| | |} | | |} |
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| | <br> | | <br> |
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| − | {| align="center" cellpadding="2" 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%"
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| − | |- style="height:40px"
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| − | | width="2%" |
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| − | | width="18%" |
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| − | | width="60%" |
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| − | | align="center" width="20%" | <math>\text{Definition 1}\!</math>
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| − | |- style="height:40px"
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| − | | style="border-top:1px solid black" |
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| − | | style="border-top:1px solid black" | <math>\text{If}\!</math>
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| − | | style="border-top:1px solid black" | <math>Q \subseteq X</math>
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| − | | style="border-top:1px solid black" |
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| − | |- style="height:40px"
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| − | | <math>\text{then}\!</math>
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| − | | <math>\upharpoonleft Q \upharpoonright ~:~ X \to \underline\mathbb{B}</math>
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| − | |
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| − | |- style="height:40px"
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| − | | <math>\text{such that:}\!</math>
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| − | |- style="height:40px"
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| − | | style="border-top:1px solid black" |
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| − | | style="border-top:1px solid black" | <math>\text{D1a.}\!</math>
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| − | | style="border-top:1px solid black" | <math>\upharpoonleft Q \upharpoonright (x) ~\Leftrightarrow~ x \in Q</math>
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| − | | align="center" style="border-top:1px solid black" | <math>\forall x \in X</math>
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| − | |}
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| | ===Definition 3=== | | ===Definition 3=== |