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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 465 | . 2 ⊢ (𝜑 → ((𝜓 ∧ 𝜏) ↔ (𝜒 ∧ 𝜏))) |
| 3 | bi2an9.2 | . . 3 ⊢ (𝜃 → (𝜏 ↔ 𝜂)) | |
| 4 | 3 | anbi2d 464 | . 2 ⊢ (𝜃 → ((𝜒 ∧ 𝜏) ↔ (𝜒 ∧ 𝜂))) |
| 5 | 2, 4 | sylan9bb 462 | 1 ⊢ ((𝜑 ∧ 𝜃) → ((𝜓 ∧ 𝜏) ↔ (𝜒 ∧ 𝜂))) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: bi2anan9r 611 rspc2gv 2933 ralprg 3740 raltpg 3742 prssg 3851 prsspwg 3854 ssprss 3855 opelopab2a 4383 opelxp 4779 eqrel 4839 eqrelrel 4851 brcog 4922 dff13 5941 resoprab2 6150 ovig 6175 dfoprab4f 6387 f1o2ndf1 6424 eroveu 6860 th3qlem1 6871 th3qlem2 6872 th3q 6874 oviec 6875 endisj 7075 exmidapne 7574 dfplpq2 7669 dfmpq2 7670 ordpipqqs 7689 enq0enq 7746 mulnnnq0 7765 ltsrprg 8062 axcnre 8196 axmulgt0 8345 addltmul 9475 ltxr 10108 sumsqeq0 10980 ccat0 11284 mul0inf 11926 dvds2lem 12489 opoe 12581 omoe 12582 opeo 12583 omeo 12584 gcddvds 12659 dfgcd2 12710 pcqmul 13001 xpsfrnel2 13559 eqgval 13940 txbasval 15132 cnmpt12 15152 cnmpt22 15159 lgsquadlem3 15952 lgsquad 15953 2sqlem7 15994 |
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