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| Description: Theorem 19.7 of [Margaris] p. 89. |
| Ref | Expression |
|---|---|
| alnex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ex 981 |
. 2
| |
| 2 | 1 | con2bii 221 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: alex 1034 alinexa 1042 exanali 1043 alexn 1044 19.29 1071 19.43 1088 19.33b 1092 19.41 1095 nex 1101 nexd 1102 a12lem2 1377 mo 1393 mo2 1400 2mo 1447 mo2icl 1923 dm0rn0 3330 reldm0 3331 imadif 3574 fn0 3605 kmlem4 4768 axpowndlem3 4951 axpownd 4953 cnfilca 10583 cnfilcaOLD 10584 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 |
| This theorem depends on definitions: df-bi 147 df-ex 981 |