Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > eqrd | Structured version Visualization version GIF version |
Description: Deduce equality of classes from equivalence of membership. (Contributed by Thierry Arnoux, 21-Mar-2017.) |
Ref | Expression |
---|---|
eqrd.0 | ⊢ Ⅎ𝑥𝜑 |
eqrd.1 | ⊢ Ⅎ𝑥𝐴 |
eqrd.2 | ⊢ Ⅎ𝑥𝐵 |
eqrd.3 | ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) |
Ref | Expression |
---|---|
eqrd | ⊢ (𝜑 → 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqrd.0 | . . 3 ⊢ Ⅎ𝑥𝜑 | |
2 | eqrd.1 | . . 3 ⊢ Ⅎ𝑥𝐴 | |
3 | eqrd.2 | . . 3 ⊢ Ⅎ𝑥𝐵 | |
4 | eqrd.3 | . . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
5 | 4 | biimpd 218 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) |
6 | 1, 2, 3, 5 | ssrd 3573 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
7 | 4 | biimprd 237 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴)) |
8 | 1, 3, 2, 7 | ssrd 3573 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) |
9 | 6, 8 | eqssd 3585 | 1 ⊢ (𝜑 → 𝐴 = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 = wceq 1475 Ⅎwnf 1699 ∈ wcel 1977 Ⅎwnfc 2738 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-in 3547 df-ss 3554 |
This theorem is referenced by: sniota 5795 dissnlocfin 21142 imasnopn 21303 imasncld 21304 imasncls 21305 blval2 22177 eqri 28735 fimarab 28825 ofpreima 28848 ordtconlem1 29298 qqhval2 29354 bj-sspwpwab 32239 bj-xnex 32245 topdifinfindis 32370 icorempt2 32375 isbasisrelowllem1 32379 isbasisrelowllem2 32380 areaquad 36821 rfcnpre1 38201 rfcnpre2 38213 |
Copyright terms: Public domain | W3C validator |