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| Mirrors > Home > MPE Home > Th. List > elimasni | Structured version Visualization version GIF version | ||
| Description: Membership in an image of a singleton. (Contributed by NM, 5-Aug-2010.) |
| Ref | Expression |
|---|---|
| elimasni | ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | noel 4285 | . . . . 5 ⊢ ¬ 𝐶 ∈ ∅ | |
| 2 | snprc 4667 | . . . . . . . . 9 ⊢ (¬ 𝐵 ∈ V ↔ {𝐵} = ∅) | |
| 3 | 2 | biimpi 216 | . . . . . . . 8 ⊢ (¬ 𝐵 ∈ V → {𝐵} = ∅) |
| 4 | 3 | imaeq2d 6008 | . . . . . . 7 ⊢ (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = (𝐴 “ ∅)) |
| 5 | ima0 6025 | . . . . . . 7 ⊢ (𝐴 “ ∅) = ∅ | |
| 6 | 4, 5 | eqtrdi 2782 | . . . . . 6 ⊢ (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = ∅) |
| 7 | 6 | eleq2d 2817 | . . . . 5 ⊢ (¬ 𝐵 ∈ V → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐶 ∈ ∅)) |
| 8 | 1, 7 | mtbiri 327 | . . . 4 ⊢ (¬ 𝐵 ∈ V → ¬ 𝐶 ∈ (𝐴 “ {𝐵})) |
| 9 | 8 | con4i 114 | . . 3 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵 ∈ V) |
| 10 | elex 3457 | . . 3 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐶 ∈ V) | |
| 11 | 9, 10 | jca 511 | . 2 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → (𝐵 ∈ V ∧ 𝐶 ∈ V)) |
| 12 | elimasng1 6035 | . . 3 ⊢ ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐵𝐴𝐶)) | |
| 13 | 12 | biimpd 229 | . 2 ⊢ ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶)) |
| 14 | 11, 13 | mpcom 38 | 1 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2111 Vcvv 3436 ∅c0 4280 {csn 4573 class class class wbr 5089 “ cima 5617 |
| 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 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-ext 2703 ax-sep 5232 ax-nul 5242 ax-pr 5368 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2710 df-cleq 2723 df-clel 2806 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-sn 4574 df-pr 4576 df-op 4580 df-br 5090 df-opab 5152 df-xp 5620 df-cnv 5622 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 |
| This theorem is referenced by: dffv2 6917 poimirlem2 37672 poimirlem23 37693 |
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