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Mirrors > Home > ILE Home > Th. List > bitr3i | GIF version |
Description: An inference from transitive law for logical equivalence. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
bitr3i.1 | ⊢ (𝜓 ↔ 𝜑) |
bitr3i.2 | ⊢ (𝜓 ↔ 𝜒) |
Ref | Expression |
---|---|
bitr3i | ⊢ (𝜑 ↔ 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bitr3i.1 | . . 3 ⊢ (𝜓 ↔ 𝜑) | |
2 | 1 | bicomi 130 | . 2 ⊢ (𝜑 ↔ 𝜓) |
3 | bitr3i.2 | . 2 ⊢ (𝜓 ↔ 𝜒) | |
4 | 2, 3 | bitri 182 | 1 ⊢ (𝜑 ↔ 𝜒) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: 3bitrri 205 3bitr3i 208 3bitr3ri 209 anandi 554 anandir 555 xchnxbi 637 orordi 722 orordir 723 sbco3v 1884 elsb3 1893 elsb4 1894 sbco4 1924 abeq1i 2190 r19.41 2509 rexcom4a 2623 moeq 2767 mosubt 2769 2reuswapdc 2794 nfcdeq 2812 sbcid 2830 sbcco2 2837 sbc7 2841 sbcie2g 2847 eqsbc3 2853 sbcralt 2890 sbcrext 2891 cbvralcsf 2964 cbvrexcsf 2965 cbvrabcsf 2967 abss 3063 ssab 3064 difrab 3238 prsspw 3557 brab1 3830 unopab 3857 exss 3982 uniuni 4201 elvvv 4421 eliunxp 4493 ralxp 4497 rexxp 4498 opelco 4525 reldm0 4571 resieq 4640 resiexg 4673 iss 4674 imai 4701 cnvsym 4728 intasym 4729 asymref 4730 codir 4733 poirr2 4737 rninxp 4784 cnvsom 4881 funopg 4954 fin 5096 f1cnvcnv 5120 fndmin 5295 resoprab 5617 mpt22eqb 5630 ov6g 5658 offval 5739 dfopab2 5835 dfoprab3s 5836 fmpt2x 5846 spc2ed 5874 brtpos0 5890 dftpos3 5900 tpostpos 5902 ercnv 6150 xpcomco 6323 xpassen 6327 phpm 6351 elni2 6504 elfz2nn0 9128 elfzmlbp 9143 expival 9478 clim0 10124 |
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