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Definition 3
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If f, g : U -> V,
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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>\operatorname{Definition~3}</math>
 
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|}
D3a. f = g.
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D3b. f(u) = g(u), for all u C U.
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</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>f, g ~:~ X \to Y</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{D3a.}</math>
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| width="80%" style="border-top:1px solid black" | <math>f ~=~ g</math>
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|- style="height:60px"
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| &nbsp;
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| <math>\operatorname{D3b.}</math>
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| <math>\overset{X}{\underset{x}{\forall}}~ (f(x) ~=~ g(x))</math>
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|}
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|}
    
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