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Mirrors > Home > MPE Home > Th. List > spc2ev | Structured version Visualization version GIF version |
Description: Existential specialization, using implicit substitution. (Contributed by NM, 3-Aug-1995.) |
Ref | Expression |
---|---|
spc2ev.1 | ⊢ 𝐴 ∈ V |
spc2ev.2 | ⊢ 𝐵 ∈ V |
spc2ev.3 | ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
spc2ev | ⊢ (𝜓 → ∃𝑥∃𝑦𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | spc2ev.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | spc2ev.2 | . 2 ⊢ 𝐵 ∈ V | |
3 | spc2ev.3 | . . 3 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) | |
4 | 3 | spc2egv 3600 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝜓 → ∃𝑥∃𝑦𝜑)) |
5 | 1, 2, 4 | mp2an 690 | 1 ⊢ (𝜓 → ∃𝑥∃𝑦𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1533 ∃wex 1776 ∈ wcel 2110 Vcvv 3495 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 df-cleq 2814 df-clel 2893 |
This theorem is referenced by: relop 5716 endisj 8598 dcomex 9863 axcnre 10580 hashle2pr 13829 wlk2f 27405 uhgr3cyclex 27955 qqhval2 31218 satfv1 32605 itg2addnclem3 34939 funop1 43475 |
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