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Mirrors > Home > MPE Home > Th. List > elabd | Structured version Visualization version GIF version |
Description: Explicit demonstration the class {𝑥 ∣ 𝜓} is not empty by the example 𝑋. (Contributed by RP, 12-Aug-2020.) |
Ref | Expression |
---|---|
elab.xex | ⊢ (𝜑 → 𝑋 ∈ V) |
elab.xmaj | ⊢ (𝜑 → 𝜒) |
elab.xsub | ⊢ (𝑥 = 𝑋 → (𝜓 ↔ 𝜒)) |
Ref | Expression |
---|---|
elabd | ⊢ (𝜑 → ∃𝑥𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elab.xex | . 2 ⊢ (𝜑 → 𝑋 ∈ V) | |
2 | elab.xmaj | . 2 ⊢ (𝜑 → 𝜒) | |
3 | elab.xsub | . . 3 ⊢ (𝑥 = 𝑋 → (𝜓 ↔ 𝜒)) | |
4 | 3 | spcegv 3294 | . 2 ⊢ (𝑋 ∈ V → (𝜒 → ∃𝑥𝜓)) |
5 | 1, 2, 4 | sylc 65 | 1 ⊢ (𝜑 → ∃𝑥𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 = wceq 1483 ∃wex 1704 ∈ wcel 1990 Vcvv 3200 |
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-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 |
This theorem is referenced by: hasheqf1od 13144 setsexstruct2 15897 wwlksnextbij 26797 clrellem 37929 clcnvlem 37930 uspgrsprfo 41756 uspgrbispr 41759 |
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