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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-elisset | Structured version Visualization version GIF version |
Description: Remove from elisset 3188 dependency on ax-ext 2590 (and on df-cleq 2603 and df-v 3175). This proof uses only df-clab 2597 and df-clel 2606 on top of first-order logic. It only requires ax-1--7 and sp 2041. Use bj-elissetv 32055 instead when sufficient (in particular when 𝑉 is substituted for V). (Contributed by BJ, 29-Apr-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-elisset | ⊢ (𝐴 ∈ 𝑉 → ∃𝑥 𝑥 = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-elissetv 32055 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑦 𝑦 = 𝐴) | |
2 | bj-denotes 32052 | . 2 ⊢ (∃𝑦 𝑦 = 𝐴 ↔ ∃𝑥 𝑥 = 𝐴) | |
3 | 1, 2 | sylib 207 | 1 ⊢ (𝐴 ∈ 𝑉 → ∃𝑥 𝑥 = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∃wex 1695 ∈ wcel 1977 |
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-12 2034 |
This theorem depends on definitions: df-bi 196 df-an 385 df-ex 1696 df-sb 1868 df-clab 2597 df-clel 2606 |
This theorem is referenced by: bj-isseti 32058 bj-ceqsalt 32069 bj-ceqsalg 32072 bj-spcimdv 32078 bj-vtoclg1f 32103 |
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