Metamath Proof Explorer
Description: If a function is defined at a class A , the alternate function value
equals the function's value at A . (Contributed by AV, 3-Sep-2022)
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Ref |
Expression |
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Assertion |
dfatafv2eqfv |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
dfafv22 |
|
2 |
|
iftrue |
|
3 |
1 2
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eqtrid |
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