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Description: Two functions that are eventually equal to one another have the same superior limit. (Contributed by Glauco Siliprandi, 23-Oct-2021)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | limsupequz.1 | |- F/ k ph |
|
| limsupequz.2 | |- F/_ k F |
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| limsupequz.3 | |- F/_ k G |
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| limsupequz.4 | |- ( ph -> M e. ZZ ) |
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| limsupequz.5 | |- ( ph -> F Fn ( ZZ>= ` M ) ) |
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| limsupequz.6 | |- ( ph -> N e. ZZ ) |
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| limsupequz.7 | |- ( ph -> G Fn ( ZZ>= ` N ) ) |
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| limsupequz.8 | |- ( ph -> K e. ZZ ) |
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| limsupequz.9 | |- ( ( ph /\ k e. ( ZZ>= ` K ) ) -> ( F ` k ) = ( G ` k ) ) |
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| Assertion | limsupequz | |- ( ph -> ( limsup ` F ) = ( limsup ` G ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | limsupequz.1 | |- F/ k ph |
|
| 2 | limsupequz.2 | |- F/_ k F |
|
| 3 | limsupequz.3 | |- F/_ k G |
|
| 4 | limsupequz.4 | |- ( ph -> M e. ZZ ) |
|
| 5 | limsupequz.5 | |- ( ph -> F Fn ( ZZ>= ` M ) ) |
|
| 6 | limsupequz.6 | |- ( ph -> N e. ZZ ) |
|
| 7 | limsupequz.7 | |- ( ph -> G Fn ( ZZ>= ` N ) ) |
|
| 8 | limsupequz.8 | |- ( ph -> K e. ZZ ) |
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| 9 | limsupequz.9 | |- ( ( ph /\ k e. ( ZZ>= ` K ) ) -> ( F ` k ) = ( G ` k ) ) |
|
| 10 | nfv | |- F/ j ph |
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| 11 | nfv | |- F/ k j e. ( ZZ>= ` K ) |
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| 12 | 1 11 | nfan | |- F/ k ( ph /\ j e. ( ZZ>= ` K ) ) |
| 13 | nfcv | |- F/_ k j |
|
| 14 | 2 13 | nffv | |- F/_ k ( F ` j ) |
| 15 | 3 13 | nffv | |- F/_ k ( G ` j ) |
| 16 | 14 15 | nfeq | |- F/ k ( F ` j ) = ( G ` j ) |
| 17 | 12 16 | nfim | |- F/ k ( ( ph /\ j e. ( ZZ>= ` K ) ) -> ( F ` j ) = ( G ` j ) ) |
| 18 | eleq1w | |- ( k = j -> ( k e. ( ZZ>= ` K ) <-> j e. ( ZZ>= ` K ) ) ) |
|
| 19 | 18 | anbi2d | |- ( k = j -> ( ( ph /\ k e. ( ZZ>= ` K ) ) <-> ( ph /\ j e. ( ZZ>= ` K ) ) ) ) |
| 20 | fveq2 | |- ( k = j -> ( F ` k ) = ( F ` j ) ) |
|
| 21 | fveq2 | |- ( k = j -> ( G ` k ) = ( G ` j ) ) |
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| 22 | 20 21 | eqeq12d | |- ( k = j -> ( ( F ` k ) = ( G ` k ) <-> ( F ` j ) = ( G ` j ) ) ) |
| 23 | 19 22 | imbi12d | |- ( k = j -> ( ( ( ph /\ k e. ( ZZ>= ` K ) ) -> ( F ` k ) = ( G ` k ) ) <-> ( ( ph /\ j e. ( ZZ>= ` K ) ) -> ( F ` j ) = ( G ` j ) ) ) ) |
| 24 | 17 23 9 | chvarfv | |- ( ( ph /\ j e. ( ZZ>= ` K ) ) -> ( F ` j ) = ( G ` j ) ) |
| 25 | 10 4 5 6 7 8 24 | limsupequzlem | |- ( ph -> ( limsup ` F ) = ( limsup ` G ) ) |