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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 2923 ralprg 3724 raltpg 3726 prssg 3835 prsspwg 3838 ssprss 3839 opelopab2a 4365 opelxp 4761 eqrel 4821 eqrelrel 4833 brcog 4903 dff13 5919 resoprab2 6128 ovig 6153 dfoprab4f 6365 f1o2ndf1 6402 eroveu 6838 th3qlem1 6849 th3qlem2 6850 th3q 6852 oviec 6853 endisj 7051 exmidapne 7522 dfplpq2 7617 dfmpq2 7618 ordpipqqs 7637 enq0enq 7694 mulnnnq0 7713 ltsrprg 8010 axcnre 8144 axmulgt0 8293 addltmul 9423 ltxr 10054 sumsqeq0 10926 ccat0 11222 mul0inf 11864 dvds2lem 12427 opoe 12519 omoe 12520 opeo 12521 omeo 12522 gcddvds 12597 dfgcd2 12648 pcqmul 12939 xpsfrnel2 13492 eqgval 13873 txbasval 15061 cnmpt12 15081 cnmpt22 15088 lgsquadlem3 15881 lgsquad 15882 2sqlem7 15923 |
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