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Mirrors > Home > MPE Home > Th. List > bibi2d | Structured version Visualization version GIF version |
Description: Deduction adding a biconditional to the left in an equivalence. (Contributed by NM, 11-May-1993.) (Proof shortened by Wolf Lammen, 19-May-2013.) |
Ref | Expression |
---|---|
imbid.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
bibi2d | ⊢ (𝜑 → ((𝜃 ↔ 𝜓) ↔ (𝜃 ↔ 𝜒))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imbid.1 | . . . . 5 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | pm5.74i 273 | . . . 4 ⊢ ((𝜑 → 𝜓) ↔ (𝜑 → 𝜒)) |
3 | 2 | bibi2i 340 | . . 3 ⊢ (((𝜑 → 𝜃) ↔ (𝜑 → 𝜓)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜒))) |
4 | pm5.74 272 | . . 3 ⊢ ((𝜑 → (𝜃 ↔ 𝜓)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜓))) | |
5 | pm5.74 272 | . . 3 ⊢ ((𝜑 → (𝜃 ↔ 𝜒)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜒))) | |
6 | 3, 4, 5 | 3bitr4i 305 | . 2 ⊢ ((𝜑 → (𝜃 ↔ 𝜓)) ↔ (𝜑 → (𝜃 ↔ 𝜒))) |
7 | 6 | pm5.74ri 274 | 1 ⊢ (𝜑 → ((𝜃 ↔ 𝜓) ↔ (𝜃 ↔ 𝜒))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 |
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 209 |
This theorem is referenced by: bibi1d 346 bibi12d 348 biantr 804 eujust 2656 eujustALT 2657 euf 2661 reu6i 3721 sbc2or 3783 axrep1 5193 axreplem 5194 zfrepclf 5200 axsepg 5206 zfauscl 5207 notzfaus 5264 copsexgw 5383 copsexg 5384 euotd 5405 cnveq0 6056 iotaval 6331 iota5 6340 eufnfv 6993 isoeq1 7072 isoeq3 7074 isores2 7088 isores3 7090 isotr 7091 isoini2 7094 riota5f 7144 caovordg 7357 caovord 7361 dfoprab4f 7756 seqomlem2 8089 xpf1o 8681 aceq0 9546 dfac5 9556 zfac 9884 zfcndrep 10038 zfcndac 10043 ltasr 10524 axpre-ltadd 10591 absmod0 14665 absz 14673 smuval2 15833 prmdvdsexp 16061 isacs2 16926 isacs1i 16930 mreacs 16931 abvfval 19591 abvpropd 19615 isclo2 21698 t0sep 21934 kqt0lem 22346 r0sep 22358 iccpnfcnv 23550 rolle 24589 2sqreultlem 26025 2sqreunnltlem 26028 tgjustr 26262 wlkeq 27417 eigre 29614 fgreu 30419 fcnvgreu 30420 xrge0iifcnv 31178 cvmlift2lem13 32564 iota5f 32957 nn0prpwlem 33672 nn0prpw 33673 bj-zfauscl 34245 wl-eudf 34810 ismndo2 35154 islaut 37221 ispautN 37237 mrefg2 39311 zindbi 39550 jm2.19lem3 39595 alephiso2 39924 ntrneiel2 40443 ntrneik4 40458 iotavalb 40769 eusnsn 43268 aiota0def 43301 fargshiftfo 43609 line2x 44748 |
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