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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 3432 | . 2 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃*𝑥 ∈ 𝐴 𝜑)) | |
2 | rmo4.1 | . . . 4 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
3 | 2 | rmo4 3723 | . . 3 ⊢ (∃*𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦)) |
4 | 3 | anbi2i 624 | . 2 ⊢ ((∃𝑥 ∈ 𝐴 𝜑 ∧ ∃*𝑥 ∈ 𝐴 𝜑) ↔ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝜑 ∧ 𝜓) → 𝑥 = 𝑦))) |
5 | 1, 4 | bitri 277 | 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 208 ∧ wa 398 ∀wral 3140 ∃wrex 3141 ∃!wreu 3142 ∃*wrmo 3143 |
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 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-mo 2622 df-eu 2654 df-clel 2895 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 |
This theorem is referenced by: reuind 3746 oawordeulem 8182 fin23lem23 9750 nqereu 10353 receu 11287 lbreu 11593 cju 11636 fprodser 15305 divalglem9 15754 ndvdssub 15762 qredeu 16004 pj1eu 18824 efgredeu 18880 lspsneu 19897 qtopeu 22326 qtophmeo 22427 minveclem7 24040 ig1peu 24767 coeeu 24817 plydivalg 24890 hlcgreu 26406 mirreu3 26442 trgcopyeu 26594 axcontlem2 26753 umgr2edg1 26995 umgr2edgneu 26998 usgredgreu 27002 uspgredg2vtxeu 27004 4cycl2vnunb 28071 frgr2wwlk1 28110 minvecolem7 28662 hlimreui 29018 riesz4i 29842 cdjreui 30211 xreceu 30600 cvmseu 32525 nocvxmin 33250 segconeu 33474 outsideofeu 33594 poimirlem4 34898 bfp 35104 exidu1 35136 rngoideu 35183 lshpsmreu 36247 cdleme 37698 lcfl7N 38639 mapdpg 38844 hdmap14lem6 39011 mpaaeu 39757 icceuelpart 43603 |
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