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Mirrors > Home > MPE Home > Th. List > Mathboxes > wl-dfreuv | Structured version Visualization version GIF version |
Description: Alternate definition of restricted existential uniqueness (df-wl-reu 34871) when 𝑥 and 𝐴 are disjoint. (Contributed by Wolf Lammen, 28-May-2023.) |
Ref | Expression |
---|---|
wl-dfreuv | ⊢ (∃!(𝑥 : 𝐴)𝜑 ↔ ∃!𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wl-dfrexv 34864 | . . 3 ⊢ (∃(𝑥 : 𝐴)𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
2 | wl-dfrmov 34869 | . . 3 ⊢ (∃*(𝑥 : 𝐴)𝜑 ↔ ∃*𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
3 | 1, 2 | anbi12i 628 | . 2 ⊢ ((∃(𝑥 : 𝐴)𝜑 ∧ ∃*(𝑥 : 𝐴)𝜑) ↔ (∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) ∧ ∃*𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) |
4 | df-wl-reu 34871 | . 2 ⊢ (∃!(𝑥 : 𝐴)𝜑 ↔ (∃(𝑥 : 𝐴)𝜑 ∧ ∃*(𝑥 : 𝐴)𝜑)) | |
5 | df-eu 2654 | . 2 ⊢ (∃!𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) ↔ (∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) ∧ ∃*𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) | |
6 | 3, 4, 5 | 3bitr4i 305 | 1 ⊢ (∃!(𝑥 : 𝐴)𝜑 ↔ ∃!𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 ∃wex 1780 ∈ wcel 2114 ∃*wmo 2620 ∃!weu 2653 ∃wl-rex 34847 ∃*wl-rmo 34848 ∃!wl-reu 34849 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-11 2161 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-mo 2622 df-eu 2654 df-clel 2893 df-wl-ral 34851 df-wl-rex 34861 df-wl-rmo 34867 df-wl-reu 34871 |
This theorem is referenced by: (None) |
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