Metamath Proof Explorer
Description: Utility theorem: reverse closure for any structure defined as a
function. (Contributed by Stefan O'Rear, 24-Aug-2015)
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Ref |
Expression |
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Hypotheses |
elbasfv.s |
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elbasfv.b |
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Assertion |
elbasfv |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
elbasfv.s |
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2 |
|
elbasfv.b |
|
3 |
|
n0i |
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4 |
|
fvprc |
|
5 |
1 4
|
syl5eq |
|
6 |
5
|
fveq2d |
|
7 |
|
base0 |
|
8 |
6 2 7
|
3eqtr4g |
|
9 |
3 8
|
nsyl2 |
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