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MyWikiBiz, Author Your Legacy — Friday November 22, 2024
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| colspan="2" | <math>\downharpoonleft s \downharpoonright ~=~ q ~=~ f_Q ~=~ \upharpoonleft Q \upharpoonright.</math>
 
| colspan="2" | <math>\downharpoonleft s \downharpoonright ~=~ q ~=~ f_Q ~=~ \upharpoonleft Q \upharpoonright.</math>
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|-
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| valign="top" | 3.
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| <math>X\!</math>
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| align="center" | <math>=\!</math>
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| <math>\{ x \in X : x \in Q \}</math>
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|-
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| &nbsp;
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| &nbsp;
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| align="center" | <math>=\!</math>
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| <math>[| \upharpoonleft X \upharpoonright |] \quad = \quad \upharpoonleft X \upharpoonright^{-1} (\underline{1})</math>
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|-
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| &nbsp;
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| &nbsp;
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| align="center" | <math>=\!</math>
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| <math>[| f_Q |] \quad = \quad f_Q^{-1} (\underline{1}).</math>
 
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<pre>
 
<pre>
3. X = {u C U : u C X}
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X = {u C U : u C X}
    
= |{X}| = {X}-1(1)
 
= |{X}| = {X}-1(1)
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