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MyWikiBiz, Author Your Legacy — Saturday October 19, 2024
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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 4
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{| align="center" cellpadding="0" cellspacing="0" width="100%"
If X c U,
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|- style="height:40px; text-align:center"
 
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| width="80%" | &nbsp;
then the following are identical subsets of UxB:
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| width="20%" | <math>\operatorname{Definition~4}</math>
 
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|}
D4a. {X}
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D4b. {<u, v> C UxB : v = [u C X]}
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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>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 identical subsets of}~ X \times \underline\mathbb{B}:</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{D4a.}</math>
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| width="80%" style="border-top:1px solid black" | <math>\upharpoonleft Q \upharpoonright</math>
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|- style="height:40px"
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| &nbsp;
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| <math>\operatorname{D4b.}</math>
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| <math>\{ (x, y) \in X \times \underline\mathbb{B} ~:~ y ~=~ \downharpoonleft x \in Q \downharpoonright</math>
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|}
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|}
    
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