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| Mirrors > Home > MPE Home > Th. List > Mathboxes > dmcnvepres | Structured version Visualization version GIF version | ||
| Description: Domain of the restricted converse epsilon relation. (Contributed by Peter Mazsa, 28-Jan-2026.) |
| Ref | Expression |
|---|---|
| dmcnvepres | ⊢ dom (◡ E ↾ 𝐴) = (𝐴 ∖ {∅}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dmres 6005 | . 2 ⊢ dom (◡ E ↾ 𝐴) = (𝐴 ∩ dom ◡ E ) | |
| 2 | dmcnvep 39137 | . . 3 ⊢ dom ◡ E = (V ∖ {∅}) | |
| 3 | 2 | ineq2i 4163 | . 2 ⊢ (𝐴 ∩ dom ◡ E ) = (𝐴 ∩ (V ∖ {∅})) |
| 4 | invdif 4225 | . 2 ⊢ (𝐴 ∩ (V ∖ {∅})) = (𝐴 ∖ {∅}) | |
| 5 | 1, 3, 4 | 3eqtri 2787 | 1 ⊢ dom (◡ E ↾ 𝐴) = (𝐴 ∖ {∅}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 Vcvv 3450 ∖ cdif 3896 ∩ cin 3898 ∅c0 4279 {csn 4584 E cep 5554 ◡ccnv 5654 dom cdm 5655 ↾ cres 5657 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-eprel 5555 df-xp 5661 df-rel 5662 df-cnv 5663 df-dm 5665 df-res 5667 |
| This theorem is used by: (None) |
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