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| Description: Principle of identity for logical equivalence. Theorem *4.2 of [WhiteheadRussell] p. 117. |
| Ref | Expression |
|---|---|
| biid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 73 |
. 2
| |
| 2 | 1, 1 | impbii 174 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: biidd 188 pm5.19 732 3anbi1i 1058 3anbi2i 1059 3anbi3i 1060 tru 1264 eqid 1884 abid2 2011 abid2f 2012 ralbii 2127 rexbii 2128 ceqsexg 2392 wecmpep 3650 ordon 3863 eqfnfv2OLD 4768 dford2 5711 aceq5 5902 aceqkm 5943 zorn 5959 elfz2nn0 7667 climadd 8377 climmul 8388 climcmp 8398 cvgcmp3cetlem2 8450 cvgcmp3ce 8451 ivthlem8 8550 grpidinv 9332 vacnlem4 9670 spwval 10002 spwnex 10004 spwpr4 10006 spwpr4OLD 10007 axgroth5 10132 grothpw 10134 axgroth6 10137 eqid1 10146 projlem 10850 osumlem2 11214 osumlem3 11215 osumlem4 11216 stri 11829 hstri 11837 stcltrthi 11850 bnj193 12063 bnj976 12861 bnj1339 13089 bnj1366 13091 bnj1383 13101 bnj1386 13103 bnj1494 13162 bnj57 13197 bnj59 13198 bnj110 13199 bnj153 13247 bnj516 13257 bnj517 13259 bnj543 13269 bnj544 13270 bnj546 13272 bnj605 13292 bnj579 13302 bnj608 13305 bnj601 13309 bnj616 13311 bnj852 13313 bnj881 13319 bnj893 13324 bnj906 13328 bnj909 13330 bnj917 13333 bnj938 13337 bnj940 13339 bnj977 13354 bnj1003 13368 bnj1029 13382 bnj1034 13385 bnj1124 13424 bnj1128 13428 bnj1127 13429 bnj1125 13430 bnj1147 13432 bnj1151 13436 bnj1188 13451 bnj1203 13454 bnj69 13455 bnj1204 13459 bnj1246 13462 bnj1248 13464 bnj1279 13473 bnj1311 13491 bnj1318 13493 bnj1333 13500 bnj1365 13504 bnj1367 13511 bnj1399 13516 bnj1407 13518 bnj1409 13519 bnj1411 13521 bnj1414 13525 bnj1420 13531 bnj1451 13542 bnj1423 13544 bnj1452 13547 bnj1493 13558 bnj1514 13565 bnj1500 13571 bnj1522 13578 dfon2 13858 axsltsolem1 14006 supdef 14604 cbvprodi 14662 vecval1b 14794 supnuf 15041 ishoma 15136 plibgax0 15320 plibgax1 15321 plibgax2 15322 plibgax3 15323 plibgax4a 15324 plibgax4b 15325 reconnlem3 15448 reconnlem4 15449 reconnlem5 15450 reconn 15451 rrndstprj2 16018 iota2 16393 stbval 16731 stb3xpl 16743 grpidinvNEW 17113 paddval 17259 |
| 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 164 |