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Mirrors > Home > MPE Home > Th. List > imbi12i | Structured version Visualization version GIF version |
Description: Join two logical equivalences to form equivalence of implications. (Contributed by NM, 1-Aug-1993.) |
Ref | Expression |
---|---|
imbi12i.1 | ⊢ (𝜑 ↔ 𝜓) |
imbi12i.2 | ⊢ (𝜒 ↔ 𝜃) |
Ref | Expression |
---|---|
imbi12i | ⊢ ((𝜑 → 𝜒) ↔ (𝜓 → 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbi12i.1 | . 2 ⊢ (𝜑 ↔ 𝜓) | |
2 | imbi12i.2 | . 2 ⊢ (𝜒 ↔ 𝜃) | |
3 | imbi12 350 | . 2 ⊢ ((𝜑 ↔ 𝜓) → ((𝜒 ↔ 𝜃) → ((𝜑 → 𝜒) ↔ (𝜓 → 𝜃)))) | |
4 | 1, 2, 3 | mp2 9 | 1 ⊢ ((𝜑 → 𝜒) ↔ (𝜓 → 𝜃)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 210 |
This theorem is referenced by: orimdi 928 nanbi 1491 rb-bijust 1751 sbnf2 2366 sb8mo 2662 cbvmowOLD 2664 raleqbii 3197 rmo5 3379 cbvrmowOLD 3391 cbvrmo 3395 ss2ab 3987 sbcssg 4421 ssextss 5311 relop 5685 dmcosseq 5809 cotrg 5938 cnvsym 5941 intasym 5942 intirr 5945 codir 5947 qfto 5948 cnvpo 6106 dff14a 7006 porpss 7433 funcnvuni 7618 poxp 7805 infcllem 8935 cp 9304 aceq2 9530 kmlem12 9572 kmlem15 9575 zfcndpow 10027 grothprim 10245 dfinfre 11609 infrenegsup 11611 xrinfmss2 12692 algcvgblem 15911 isprm2 16016 oduglb 17741 odulub 17743 isirred2 19447 isdomn2 20065 ntreq0 21682 ist0-3 21950 ist1-3 21954 ordthaus 21989 dfconn2 22024 iscusp2 22908 mdsymlem8 30193 mo5f 30260 iuninc 30324 suppss2f 30398 tosglblem 30682 prmidl0 31034 esumpfinvalf 31445 bnj110 32240 bnj92 32244 bnj539 32273 bnj540 32274 axrepprim 33041 axacprim 33046 dffr5 33102 dfso2 33103 dfpo2 33104 elpotr 33139 bj-alcomexcom 34127 itg2addnclem2 35109 isdmn3 35512 sbcimi 35548 ssrel3 35716 inxpss3 35731 trcoss2 35884 moxfr 39633 isdomn3 40148 ifpim123g 40208 elmapintrab 40276 undmrnresiss 40304 cnvssco 40306 snhesn 40487 psshepw 40489 frege77 40641 frege93 40657 frege116 40680 frege118 40682 frege131 40695 frege133 40697 ntrneikb 40797 ismnuprim 41002 onfrALTlem5 41248 onfrALTlem5VD 41591 setis 45227 |
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