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Mirrors > Home > MPE Home > Th. List > reu4 | Structured version Visualization version GIF version |
Description: Restricted uniqueness using implicit substitution. (Contributed by NM, 23-Nov-1994.) |
Ref | Expression |
---|---|
rmo4.1 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
reu4 | ⊢ (∃!𝑥 ∈ 𝐴 𝜑 ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | reu5 3375 | . 2 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃*𝑥 ∈ 𝐴 𝜑)) | |
2 | rmo4.1 | . . . 4 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
3 | 2 | rmo4 3669 | . . 3 ⊢ (∃*𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦)) |
4 | 3 | anbi2i 625 | . 2 ⊢ ((∃𝑥 ∈ 𝐴 𝜑 ∧ ∃*𝑥 ∈ 𝐴 𝜑) ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦))) |
5 | 1, 4 | bitri 278 | 1 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∀wral 3106 ∃wrex 3107 ∃!wreu 3108 ∃*wrmo 3109 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-mo 2598 df-eu 2629 df-clel 2870 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 |
This theorem is referenced by: reuind 3692 oawordeulem 8163 fin23lem23 9737 nqereu 10340 receu 11274 lbreu 11578 cju 11621 fprodser 15295 divalglem9 15742 ndvdssub 15750 qredeu 15992 pj1eu 18814 efgredeu 18870 lspsneu 19888 qtopeu 22321 qtophmeo 22422 minveclem7 24039 ig1peu 24772 coeeu 24822 plydivalg 24895 hlcgreu 26412 mirreu3 26448 trgcopyeu 26600 axcontlem2 26759 umgr2edg1 27001 umgr2edgneu 27004 usgredgreu 27008 uspgredg2vtxeu 27010 4cycl2vnunb 28075 frgr2wwlk1 28114 minvecolem7 28666 hlimreui 29022 riesz4i 29846 cdjreui 30215 xreceu 30624 cvmseu 32636 nocvxmin 33361 segconeu 33585 outsideofeu 33705 poimirlem4 35061 bfp 35262 exidu1 35294 rngoideu 35341 lshpsmreu 36405 cdleme 37856 lcfl7N 38797 mapdpg 39002 hdmap14lem6 39169 mpaaeu 40094 icceuelpart 43953 |
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