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| Description: A contraposition inference. |
| Ref | Expression |
|---|---|
| con3.a |
|
| Ref | Expression |
|---|---|
| con3i |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nega 84 |
. . 3
| |
| 2 | con3.a |
. . 3
| |
| 3 | 1, 2 | syl 10 |
. 2
|
| 4 | 3 | con1i 96 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: pm2.5 100 pm2.51 101 pm2.52 102 mto 106 nsyl 116 negbii 187 pm2.45 277 pm2.46 278 orim12i 336 pm5.14 662 pm5.21ni 675 con3th 763 ax67 994 ax67to6 995 ax467to6 999 19.29 1047 sbn 1215 ax11indalem 1345 a12lem2 1354 moexex 1415 necon3ai 1582 necon3bi 1583 sbc2or 1929 difrab 2244 noel 2255 mosubopt 2767 eldifpw 2873 nlimsucg 3075 findsg 3120 tfindsg 3125 vtoclibr 3175 soirri 3391 nfvres 3687 fvopab4ndm 3723 fvopabn 3725 canth 3846 oprprc1 3923 ndmoprass 3988 ndmoprdistr 3989 curry1val 4038 eceqopreq 4251 ensdomtr 4405 sdomirr 4406 sdomen2 4416 en2lp 4526 isfinite 4558 nnsdom 4559 rankxplim3 4638 rankxpsuc 4639 ac6n 4681 ac9s 4688 kmlem2 4690 alephnbtwn 4791 alephnbtwn2 4792 alephval2 4825 dominf 4827 cdainf 4860 nd3 4863 axrepnd 4869 nlt1pi 4956 lt1nnn 5846 zeot 6097 uzssz 6313 sumsqne0 6516 nnesq 6543 climcl 6867 clmi1 6975 ruclem28 7431 issubg 8001 fiiu 8709 neiopne 8728 hmeogrp 8776 fgsb 8794 fgsb2 8799 cnfilca 8801 avril1 8964 nonbool 9727 chpssat 10412 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 |