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Description: Relate elementhood to a closed interval with elementhood to the same closed-below, open-above interval or to its upper bound. (Contributed by Thierry Arnoux, 3-Jul-2017)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | eliccelico | |- ( ( A e. RR* /\ B e. RR* /\ A <_ B ) -> ( C e. ( A [,] B ) <-> ( C e. ( A [,) B ) \/ C = B ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl1 | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> A e. RR* ) |
|
| 2 | simpl2 | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> B e. RR* ) |
|
| 3 | simprl | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> C e. ( A [,] B ) ) |
|
| 4 | elicc1 | |- ( ( A e. RR* /\ B e. RR* ) -> ( C e. ( A [,] B ) <-> ( C e. RR* /\ A <_ C /\ C <_ B ) ) ) |
|
| 5 | 4 | biimpa | |- ( ( ( A e. RR* /\ B e. RR* ) /\ C e. ( A [,] B ) ) -> ( C e. RR* /\ A <_ C /\ C <_ B ) ) |
| 6 | 5 | simp1d | |- ( ( ( A e. RR* /\ B e. RR* ) /\ C e. ( A [,] B ) ) -> C e. RR* ) |
| 7 | 1 2 3 6 | syl21anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> C e. RR* ) |
| 8 | 5 | simp3d | |- ( ( ( A e. RR* /\ B e. RR* ) /\ C e. ( A [,] B ) ) -> C <_ B ) |
| 9 | 1 2 3 8 | syl21anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> C <_ B ) |
| 10 | 1 2 | jca | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> ( A e. RR* /\ B e. RR* ) ) |
| 11 | simprr | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> -. C e. ( A [,) B ) ) |
|
| 12 | 5 | simp2d | |- ( ( ( A e. RR* /\ B e. RR* ) /\ C e. ( A [,] B ) ) -> A <_ C ) |
| 13 | 10 3 12 | syl2anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> A <_ C ) |
| 14 | elico1 | |- ( ( A e. RR* /\ B e. RR* ) -> ( C e. ( A [,) B ) <-> ( C e. RR* /\ A <_ C /\ C < B ) ) ) |
|
| 15 | 14 | notbid | |- ( ( A e. RR* /\ B e. RR* ) -> ( -. C e. ( A [,) B ) <-> -. ( C e. RR* /\ A <_ C /\ C < B ) ) ) |
| 16 | 15 | biimpa | |- ( ( ( A e. RR* /\ B e. RR* ) /\ -. C e. ( A [,) B ) ) -> -. ( C e. RR* /\ A <_ C /\ C < B ) ) |
| 17 | df-3an | |- ( ( C e. RR* /\ A <_ C /\ C < B ) <-> ( ( C e. RR* /\ A <_ C ) /\ C < B ) ) |
|
| 18 | 17 | notbii | |- ( -. ( C e. RR* /\ A <_ C /\ C < B ) <-> -. ( ( C e. RR* /\ A <_ C ) /\ C < B ) ) |
| 19 | imnan | |- ( ( ( C e. RR* /\ A <_ C ) -> -. C < B ) <-> -. ( ( C e. RR* /\ A <_ C ) /\ C < B ) ) |
|
| 20 | 18 19 | bitr4i | |- ( -. ( C e. RR* /\ A <_ C /\ C < B ) <-> ( ( C e. RR* /\ A <_ C ) -> -. C < B ) ) |
| 21 | 16 20 | sylib | |- ( ( ( A e. RR* /\ B e. RR* ) /\ -. C e. ( A [,) B ) ) -> ( ( C e. RR* /\ A <_ C ) -> -. C < B ) ) |
| 22 | 21 | imp | |- ( ( ( ( A e. RR* /\ B e. RR* ) /\ -. C e. ( A [,) B ) ) /\ ( C e. RR* /\ A <_ C ) ) -> -. C < B ) |
| 23 | 10 11 7 13 22 | syl22anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> -. C < B ) |
| 24 | xeqlelt | |- ( ( C e. RR* /\ B e. RR* ) -> ( C = B <-> ( C <_ B /\ -. C < B ) ) ) |
|
| 25 | 24 | biimpar | |- ( ( ( C e. RR* /\ B e. RR* ) /\ ( C <_ B /\ -. C < B ) ) -> C = B ) |
| 26 | 7 2 9 23 25 | syl22anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) ) -> C = B ) |
| 27 | 26 | ex | |- ( ( A e. RR* /\ B e. RR* /\ A <_ B ) -> ( ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) -> C = B ) ) |
| 28 | pm5.6 | |- ( ( ( C e. ( A [,] B ) /\ -. C e. ( A [,) B ) ) -> C = B ) <-> ( C e. ( A [,] B ) -> ( C e. ( A [,) B ) \/ C = B ) ) ) |
|
| 29 | 27 28 | sylib | |- ( ( A e. RR* /\ B e. RR* /\ A <_ B ) -> ( C e. ( A [,] B ) -> ( C e. ( A [,) B ) \/ C = B ) ) ) |
| 30 | icossicc | |- ( A [,) B ) C_ ( A [,] B ) |
|
| 31 | simpr | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C e. ( A [,) B ) ) -> C e. ( A [,) B ) ) |
|
| 32 | 30 31 | sselid | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C e. ( A [,) B ) ) -> C e. ( A [,] B ) ) |
| 33 | simpr | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> C = B ) |
|
| 34 | simpl2 | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> B e. RR* ) |
|
| 35 | 33 34 | eqeltrd | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> C e. RR* ) |
| 36 | simpl3 | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> A <_ B ) |
|
| 37 | 36 33 | breqtrrd | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> A <_ C ) |
| 38 | 34 | xrleidd | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> B <_ B ) |
| 39 | 33 38 | eqbrtrd | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> C <_ B ) |
| 40 | simpl1 | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> A e. RR* ) |
|
| 41 | 40 34 4 | syl2anc | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> ( C e. ( A [,] B ) <-> ( C e. RR* /\ A <_ C /\ C <_ B ) ) ) |
| 42 | 35 37 39 41 | mpbir3and | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ C = B ) -> C e. ( A [,] B ) ) |
| 43 | 32 42 | jaodan | |- ( ( ( A e. RR* /\ B e. RR* /\ A <_ B ) /\ ( C e. ( A [,) B ) \/ C = B ) ) -> C e. ( A [,] B ) ) |
| 44 | 43 | ex | |- ( ( A e. RR* /\ B e. RR* /\ A <_ B ) -> ( ( C e. ( A [,) B ) \/ C = B ) -> C e. ( A [,] B ) ) ) |
| 45 | 29 44 | impbid | |- ( ( A e. RR* /\ B e. RR* /\ A <_ B ) -> ( C e. ( A [,] B ) <-> ( C e. ( A [,) B ) \/ C = B ) ) ) |