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| Mirrors > Home > MPE Home > Th. List > Mathboxes > brcnvepres | Structured version Visualization version GIF version | ||
| Description: Restricted converse epsilon binary relation. (Contributed by Peter Mazsa, 10-Feb-2018.) |
| Ref | Expression |
|---|---|
| brcnvepres | ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑊) → (𝐵(◡ E ↾ 𝐴)𝐶 ↔ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brres 5990 | . 2 ⊢ (𝐶 ∈ 𝑊 → (𝐵(◡ E ↾ 𝐴)𝐶 ↔ (𝐵 ∈ 𝐴 ∧ 𝐵◡ E 𝐶))) | |
| 2 | brcnvep 38960 | . . 3 ⊢ (𝐵 ∈ 𝑉 → (𝐵◡ E 𝐶 ↔ 𝐶 ∈ 𝐵)) | |
| 3 | 2 | anbi2d 642 | . 2 ⊢ (𝐵 ∈ 𝑉 → ((𝐵 ∈ 𝐴 ∧ 𝐵◡ E 𝐶) ↔ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐵))) |
| 4 | 1, 3 | sylan9bbr 520 | 1 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑊) → (𝐵(◡ E ↾ 𝐴)𝐶 ↔ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐵))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∈ wcel 2146 class class class wbr 5114 E cep 5565 ◡ccnv 5665 ↾ cres 5668 |
| 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 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pr 5409 |
| 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-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ne 2962 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-eprel 5566 df-xp 5672 df-rel 5673 df-cnv 5674 df-res 5678 |
| This theorem is used by: dfeldisj3 39501 dfeldisj4 39502 |
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