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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 260 | . . . 4 ⊢ ((𝜑 → 𝜓) ↔ (𝜑 → 𝜒)) |
3 | 2 | bibi2i 327 | . . 3 ⊢ (((𝜑 → 𝜃) ↔ (𝜑 → 𝜓)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜒))) |
4 | pm5.74 259 | . . 3 ⊢ ((𝜑 → (𝜃 ↔ 𝜓)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜓))) | |
5 | pm5.74 259 | . . 3 ⊢ ((𝜑 → (𝜃 ↔ 𝜒)) ↔ ((𝜑 → 𝜃) ↔ (𝜑 → 𝜒))) | |
6 | 3, 4, 5 | 3bitr4i 292 | . 2 ⊢ ((𝜑 → (𝜃 ↔ 𝜓)) ↔ (𝜑 → (𝜃 ↔ 𝜒))) |
7 | 6 | pm5.74ri 261 | 1 ⊢ (𝜑 → ((𝜃 ↔ 𝜓) ↔ (𝜃 ↔ 𝜒))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 |
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 197 |
This theorem is referenced by: bibi1d 333 bibi12d 335 biantr 972 bimsc1 980 eujust 2472 eujustALT 2473 euf 2478 reu6i 3397 sbc2or 3444 axrep1 4772 axrep2 4773 axrep3 4774 zfrepclf 4777 axsep2 4782 zfauscl 4783 copsexg 4956 euotd 4975 cnveq0 5591 iotaval 5862 iota5 5871 eufnfv 6491 isoeq1 6567 isoeq3 6569 isores2 6583 isores3 6585 isotr 6586 isoini2 6589 riota5f 6636 caovordg 6841 caovord 6845 dfoprab4f 7226 seqomlem2 7546 xpf1o 8122 aceq0 8941 dfac5 8951 zfac 9282 zfcndrep 9436 zfcndac 9441 ltasr 9921 axpre-ltadd 9988 absmod0 14043 absz 14051 smuval2 15204 prmdvdsexp 15427 isacs2 16314 isacs1i 16318 mreacs 16319 abvfval 18818 abvpropd 18842 isclo2 20892 t0sep 21128 kqt0lem 21539 r0sep 21551 iccpnfcnv 22743 rolle 23753 wlkeq 26529 eigre 28694 fgreu 29471 fcnvgreu 29472 xrge0iifcnv 29979 cvmlift2lem13 31297 iota5f 31606 nn0prpwlem 32317 nn0prpw 32318 bj-axrep1 32788 bj-axrep2 32789 bj-axrep3 32790 bj-axsep2 32921 wl-eudf 33354 ismndo2 33673 islaut 35369 ispautN 35385 mrefg2 37270 zindbi 37511 jm2.19lem3 37558 ntrneiel2 38384 ntrneik4 38399 iotavalb 38631 fargshiftfo 41378 |
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