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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 4409 opelxp 4806 eqrel 4866 eqrelrel 4878 brcog 4949 dff13 5977 resoprab2 6188 ovig 6213 dfoprab4f 6431 f1o2ndf1 6468 eroveu 6904 th3qlem1 6915 th3qlem2 6916 th3q 6918 oviec 6919 endisj 7126 exmidapne 7632 dfplpq2 7727 dfmpq2 7728 ordpipqqs 7747 enq0enq 7804 mulnnnq0 7823 ltsrprg 8120 axcnre 8254 axmulgt0 8403 addltmul 9553 ltxr 10194 sumsqeq0 11076 ccat0 11386 mul0inf 12032 dvds2lem 12595 opoe 12687 omoe 12688 opeo 12689 omeo 12690 gcddvds 12765 dfgcd2 12816 pcqmul 13111 xpsfrnel2 13726 eqgval 14085 txbasval 15493 cnmpt12 15513 cnmpt22 15520 lgsquadlem3 16403 lgsquad 16404 2sqlem7 16445 |
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