| Metamath Proof Explorer |
< Previous
Next >
Related theorems GIF version |
| Description: If x is effectively bound in A and B, it is effectively bound in A = B. |
| Ref | Expression |
|---|---|
| hbeq.1 | ⊢ (y ∈ A → ∀x y ∈ A) |
| hbeq.2 | ⊢ (z ∈ B → ∀x z ∈ B) |
| Ref | Expression |
|---|---|
| hbeq | ⊢ (A = B → ∀x A = B) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hbeq.1 | . . . . 5 ⊢ (y ∈ A → ∀x y ∈ A) | |
| 2 | 1 | hblem 1571 | . . . 4 ⊢ (w ∈ A → ∀x w ∈ A) |
| 3 | hbeq.2 | . . . . 5 ⊢ (z ∈ B → ∀x z ∈ B) | |
| 4 | 3 | hblem 1571 | . . . 4 ⊢ (w ∈ B → ∀x w ∈ B) |
| 5 | 2, 4 | hbbi 1016 | . . 3 ⊢ ((w ∈ A ↔ w ∈ B) → ∀x(w ∈ A ↔ w ∈ B)) |
| 6 | 5 | hbal 1011 | . 2 ⊢ (∀w(w ∈ A ↔ w ∈ B) → ∀x∀w(w ∈ A ↔ w ∈ B)) |
| 7 | dfcleq 1477 | . 2 ⊢ (A = B ↔ ∀w(w ∈ A ↔ w ∈ B)) | |
| 8 | 7 | albii 1005 | . 2 ⊢ (∀x A = B ↔ ∀x∀w(w ∈ A ↔ w ∈ B)) |
| 9 | 6, 7, 8 | 3imtr4 219 | 1 ⊢ (A = B → ∀x A = B) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 ↔ wb 146 ∀wal 958 = wceq 960 ∈ wcel 962 |
| This theorem is referenced by: hbel 1573 hbeleq 1574 hbne 1651 raleq1f 1790 rexeq1f 1791 reueq1f 1792 rabeqf 1815 hbeqd 1920 hbsbc1g 1955 hbsbcg 1958 csbieb 2039 csbie2t 2042 eusn 2456 zfrepclf 2712 moop2 2815 euuni 2895 reuuni2f 2897 reusn 2906 csbima12g 3427 hbfn 3598 hbfo 3685 hbfv 3743 csbfv12g 3756 fvopab4gf 3795 fvopabgf 3801 fvopabnf 3802 fvopab2 3805 eqfnfvf 3812 elrnopabg 3814 abrexexlem2 3873 f1fvf 3889 hbrdg 3950 csboprg 4000 oprabval2gf 4040 elrnoprabg 4138 dom2d 4418 cardprc 4874 csbnegg 5377 hbsum1 6997 hbsum 6998 fsum1f 7021 fsump1f 7025 isumnn0nna 7222 infcvgaux1 7233 fsum0diag4 7275 tgval3t 7637 iscaunns 7953 minvecdist 8593 cnlnadjlem5 10011 irredt 10330 fgsb 10575 fgsb2 10580 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 966 ax-gen 967 ax-17 975 ax-4 977 ax-5o 979 ax-6o 982 ax-9o 1129 ax-ext 1466 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 985 df-cleq 1476 df-clel 1479 |