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| Mirrors > Home > ILE Home > Th. List > bi2anan9 | GIF version | ||
| Description: Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 31-Jul-1995.) |
| Ref | Expression |
|---|---|
| bi2an9.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
| bi2an9.2 | ⊢ (𝜃 → (𝜏 ↔ 𝜂)) |
| Ref | Expression |
|---|---|
| bi2anan9 | ⊢ ((𝜑 ∧ 𝜃) → ((𝜓 ∧ 𝜏) ↔ (𝜒 ∧ 𝜂))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bi2an9.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
| 2 | 1 | anbi1d 469 | . 2 ⊢ (𝜑 → ((𝜓 ∧ 𝜏) ↔ (𝜒 ∧ 𝜏))) |
| 3 | bi2an9.2 | . . 3 ⊢ (𝜃 → (𝜏 ↔ 𝜂)) | |
| 4 | 3 | anbi2d 468 | . 2 ⊢ (𝜃 → ((𝜒 ∧ 𝜏) ↔ (𝜒 ∧ 𝜂))) |
| 5 | 2, 4 | sylan9bb 466 | 1 ⊢ ((𝜑 ∧ 𝜃) → ((𝜓 ∧ 𝜏) ↔ (𝜒 ∧ 𝜂))) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: bi2anan9r 615 rspc2gv 2942 ralprg 3760 raltpg 3762 prssg 3872 prsspwg 3875 ssprss 3876 opelopab2a 4407 opelxp 4804 eqrel 4864 eqrelrel 4876 brcog 4947 dff13 5974 resoprab2 6185 ovig 6210 dfoprab4f 6427 f1o2ndf1 6464 eroveu 6900 th3qlem1 6911 th3qlem2 6912 th3q 6914 oviec 6915 endisj 7122 exmidapne 7626 dfplpq2 7721 dfmpq2 7722 ordpipqqs 7741 enq0enq 7798 mulnnnq0 7817 ltsrprg 8114 axcnre 8248 axmulgt0 8397 addltmul 9546 ltxr 10187 sumsqeq0 11068 ccat0 11378 mul0inf 12023 dvds2lem 12586 opoe 12678 omoe 12679 opeo 12680 omeo 12681 gcddvds 12756 dfgcd2 12807 pcqmul 13102 xpsfrnel2 13716 eqgval 14075 txbasval 15417 cnmpt12 15437 cnmpt22 15444 lgsquadlem3 16296 lgsquad 16297 2sqlem7 16338 |
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