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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 7627 dfplpq2 7722 dfmpq2 7723 ordpipqqs 7742 enq0enq 7799 mulnnnq0 7818 ltsrprg 8115 axcnre 8249 axmulgt0 8398 addltmul 9547 ltxr 10188 sumsqeq0 11070 ccat0 11380 mul0inf 12026 dvds2lem 12589 opoe 12681 omoe 12682 opeo 12683 omeo 12684 gcddvds 12759 dfgcd2 12810 pcqmul 13105 xpsfrnel2 13720 eqgval 14079 txbasval 15459 cnmpt12 15479 cnmpt22 15486 lgsquadlem3 16364 lgsquad 16365 2sqlem7 16406 |
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