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Description: Part of proof of Lemma E in Crawley p. 113. (Contributed by NM, 26-Feb-2013)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | cdleme31sn1.i | |- I = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) |
|
| cdleme31sn1.n | |- N = if ( s .<_ ( P .\/ Q ) , I , D ) |
||
| cdleme31sn1.c | |- C = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) |
||
| Assertion | cdleme31sn1 | |- ( ( R e. A /\ R .<_ ( P .\/ Q ) ) -> [_ R / s ]_ N = C ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cdleme31sn1.i | |- I = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) |
|
| 2 | cdleme31sn1.n | |- N = if ( s .<_ ( P .\/ Q ) , I , D ) |
|
| 3 | cdleme31sn1.c | |- C = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) |
|
| 4 | eqid | |- if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) = if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) |
|
| 5 | 2 4 | cdleme31sn | |- ( R e. A -> [_ R / s ]_ N = if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) ) |
| 6 | 5 | adantr | |- ( ( R e. A /\ R .<_ ( P .\/ Q ) ) -> [_ R / s ]_ N = if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) ) |
| 7 | iftrue | |- ( R .<_ ( P .\/ Q ) -> if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) = [_ R / s ]_ I ) |
|
| 8 | 1 | csbeq2i | |- [_ R / s ]_ I = [_ R / s ]_ ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) |
| 9 | 7 8 | eqtrdi | |- ( R .<_ ( P .\/ Q ) -> if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) = [_ R / s ]_ ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) ) |
| 10 | nfcv | |- F/_ s A |
|
| 11 | nfv | |- F/ s ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) |
|
| 12 | nfcsb1v | |- F/_ s [_ R / s ]_ G |
|
| 13 | 12 | nfeq2 | |- F/ s y = [_ R / s ]_ G |
| 14 | 11 13 | nfim | |- F/ s ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) |
| 15 | 10 14 | nfralw | |- F/ s A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) |
| 16 | nfcv | |- F/_ s B |
|
| 17 | 15 16 | nfriota | |- F/_ s ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) |
| 18 | 17 | a1i | |- ( R e. A -> F/_ s ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 19 | csbeq1a | |- ( s = R -> G = [_ R / s ]_ G ) |
|
| 20 | 19 | eqeq2d | |- ( s = R -> ( y = G <-> y = [_ R / s ]_ G ) ) |
| 21 | 20 | imbi2d | |- ( s = R -> ( ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) <-> ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 22 | 21 | ralbidv | |- ( s = R -> ( A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) <-> A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 23 | 22 | riotabidv | |- ( s = R -> ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 24 | 18 23 | csbiegf | |- ( R e. A -> [_ R / s ]_ ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = G ) ) = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 25 | 9 24 | sylan9eqr | |- ( ( R e. A /\ R .<_ ( P .\/ Q ) ) -> if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) = ( iota_ y e. B A. t e. A ( ( -. t .<_ W /\ -. t .<_ ( P .\/ Q ) ) -> y = [_ R / s ]_ G ) ) ) |
| 26 | 25 3 | eqtr4di | |- ( ( R e. A /\ R .<_ ( P .\/ Q ) ) -> if ( R .<_ ( P .\/ Q ) , [_ R / s ]_ I , [_ R / s ]_ D ) = C ) |
| 27 | 6 26 | eqtrd | |- ( ( R e. A /\ R .<_ ( P .\/ Q ) ) -> [_ R / s ]_ N = C ) |