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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-isseti | Structured version Visualization version GIF version |
Description: Remove from isseti 3209 dependency on ax-ext 2602 (and on df-cleq 2615 and df-v 3202). This proof uses only df-clab 2609 and df-clel 2618 on top of first-order logic. It only uses ax-12 2047 among the auxiliary logical axioms. The hypothesis uses 𝑉 instead of V for extra generality. This is indeed more general as long as elex 3212 is not available. Use bj-issetiv 32863 instead when sufficient (in particular when 𝑉 is substituted for V). (Contributed by BJ, 13-Jun-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-isseti.1 | ⊢ 𝐴 ∈ 𝑉 |
Ref | Expression |
---|---|
bj-isseti | ⊢ ∃𝑥 𝑥 = 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-isseti.1 | . 2 ⊢ 𝐴 ∈ 𝑉 | |
2 | bj-elisset 32862 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑥 𝑥 = 𝐴) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∃𝑥 𝑥 = 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1483 ∃wex 1704 ∈ wcel 1990 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-12 2047 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-sb 1881 df-clab 2609 df-clel 2618 |
This theorem is referenced by: bj-rexcom4b 32872 |
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