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Mirrors > Home > ILE Home > Th. List > impbii | GIF version |
Description: Infer an equivalence from an implication and its converse. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
impbii.1 | ⊢ (𝜑 → 𝜓) |
impbii.2 | ⊢ (𝜓 → 𝜑) |
Ref | Expression |
---|---|
impbii | ⊢ (𝜑 ↔ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbii.1 | . 2 ⊢ (𝜑 → 𝜓) | |
2 | impbii.2 | . 2 ⊢ (𝜓 → 𝜑) | |
3 | bi3 118 | . 2 ⊢ ((𝜑 → 𝜓) → ((𝜓 → 𝜑) → (𝜑 ↔ 𝜓))) | |
4 | 1, 2, 3 | mp2 16 | 1 ⊢ (𝜑 ↔ 𝜓) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 106 ax-ia3 107 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: bicom 139 biid 170 2th 173 pm5.74 178 bitri 183 bibi2i 226 bi2.04 247 pm5.4 248 imdi 249 impexp 261 ancom 264 pm4.45im 332 dfbi2 385 anass 398 pm5.32 448 jcab 592 notnotnot 623 con2b 658 imnan 679 2false 690 pm5.21nii 693 pm4.8 696 oibabs 703 orcom 717 ioran 741 oridm 746 orbi2i 751 or12 755 pm4.44 768 ordi 805 andi 807 pm4.72 812 stdcndc 830 stdcndcOLD 831 stdcn 832 dcnn 833 pm4.82 934 rnlem 960 3jaob 1280 xoranor 1355 falantru 1381 3impexp 1413 3impexpbicom 1414 alcom 1454 19.26 1457 19.3h 1532 19.3 1533 19.21h 1536 19.43 1607 19.9h 1622 excom 1642 19.41h 1663 19.41 1664 equcom 1682 equsalh 1704 equsex 1706 cbvalh 1726 cbvexh 1728 sbbii 1738 sbh 1749 equs45f 1774 sb6f 1775 sbcof2 1782 sbequ8 1819 sbidm 1823 sb5rf 1824 sb6rf 1825 equvin 1835 sbimv 1865 sbalyz 1972 eu2 2041 eu3h 2042 eu5 2044 mo3h 2050 euan 2053 axext4 2121 cleqh 2237 r19.26 2556 ralcom3 2596 ceqsex 2719 gencbvex 2727 gencbvex2 2728 gencbval 2729 eqvinc 2803 pm13.183 2817 rr19.3v 2818 rr19.28v 2819 reu6 2868 reu3 2869 sbnfc2 3055 difdif 3196 ddifnel 3202 ddifstab 3203 ssddif 3305 difin 3308 uneqin 3322 indifdir 3327 undif3ss 3332 difrab 3345 un00 3404 undifss 3438 ssdifeq0 3440 ralidm 3458 ralf0 3461 ralm 3462 elpr2 3544 snidb 3550 difsnb 3658 preq12b 3692 preqsn 3697 axpweq 4090 exmidn0m 4119 exmidsssn 4120 exmid0el 4122 exmidel 4123 exmidundif 4124 exmidundifim 4125 sspwb 4133 unipw 4134 opm 4151 opth 4154 ssopab2b 4193 elon2 4293 unexb 4358 eusvnfb 4370 eusv2nf 4372 ralxfrALT 4383 uniexb 4389 iunpw 4396 sucelon 4414 unon 4422 sucprcreg 4459 opthreg 4466 ordsuc 4473 dcextest 4490 peano2b 4523 opelxp 4564 opthprc 4585 relop 4684 issetid 4688 xpid11 4757 elres 4850 iss 4860 issref 4916 xpmlem 4954 sqxpeq0 4957 ssrnres 4976 dfrel2 4984 relrelss 5060 fn0 5237 funssxp 5287 f00 5309 f0bi 5310 dffo2 5344 ffoss 5392 f1o00 5395 fo00 5396 fv3 5437 dff2 5557 dffo4 5561 dffo5 5562 fmpt 5563 ffnfv 5571 fsn 5585 fsn2 5587 isores1 5708 ssoprab2b 5821 eqfnov2 5871 cnvoprab 6124 reldmtpos 6143 mapsn 6577 mapsncnv 6582 mptelixpg 6621 elixpsn 6622 ixpsnf1o 6623 en0 6682 en1 6686 dom0 6725 exmidpw 6795 undifdcss 6804 fidcenum 6837 djuexb 6922 ctssdc 6991 exmidomni 7007 exmidfodomr 7053 elni2 7115 ltbtwnnqq 7216 enq0ref 7234 elnp1st2nd 7277 elrealeu 7630 elreal2 7631 le2tri3i 7865 elnn0nn 9012 elnnnn0b 9014 elnnnn0c 9015 elnnz 9057 elnn0z 9060 elnnz1 9070 elz2 9115 eluz2b2 9390 elnn1uz2 9394 elioo4g 9710 eluzfz2b 9806 fzm 9811 elfz1end 9828 fzass4 9835 elfz1b 9863 fz01or 9884 nn0fz0 9892 fzolb 9923 fzom 9934 elfzo0 9952 fzo1fzo0n0 9953 elfzo0z 9954 elfzo1 9960 rexanuz 10753 rexuz3 10755 sqrt0rlem 10768 fisum0diag 11203 infssuzex 11631 isprm6 11814 oddpwdclemdc 11840 ennnfone 11927 ctinfom 11930 ctinf 11932 tgclb 12223 xmetunirn 12516 bj-nnsn 12934 bdeq 13010 bdop 13062 bdunexb 13107 bj-2inf 13125 bj-nn0suc 13151 exmidsbth 13208 |
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