| Intuitionistic Logic Explorer | 
      
      
      < Previous  
      Next >
      
       Nearby theorems  | 
  ||
| Mirrors > Home > ILE Home > Th. List > ssopab2b | Unicode version | ||
| Description: Equivalence of ordered pair abstraction subclass and implication. (Contributed by NM, 27-Dec-1996.) (Proof shortened by Mario Carneiro, 18-Nov-2016.) | 
| Ref | Expression | 
|---|---|
| ssopab2b | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | nfopab1 4102 | 
. . . 4
 | |
| 2 | nfopab1 4102 | 
. . . 4
 | |
| 3 | 1, 2 | nfss 3176 | 
. . 3
 | 
| 4 | nfopab2 4103 | 
. . . . 5
 | |
| 5 | nfopab2 4103 | 
. . . . 5
 | |
| 6 | 4, 5 | nfss 3176 | 
. . . 4
 | 
| 7 | ssel 3177 | 
. . . . 5
 | |
| 8 | opabid 4290 | 
. . . . 5
 | |
| 9 | opabid 4290 | 
. . . . 5
 | |
| 10 | 7, 8, 9 | 3imtr3g 204 | 
. . . 4
 | 
| 11 | 6, 10 | alrimi 1536 | 
. . 3
 | 
| 12 | 3, 11 | alrimi 1536 | 
. 2
 | 
| 13 | ssopab2 4310 | 
. 2
 | |
| 14 | 12, 13 | impbii 126 | 
1
 | 
| Colors of variables: wff set class | 
| Syntax hints:     | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 | 
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ral 2480 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-opab 4095 | 
| This theorem is referenced by: eqopab2b 4314 dffun2 5268 | 
| Copyright terms: Public domain | W3C validator |