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| Mirrors > Home > MPE Home > Th. List > predprc | Structured version Visualization version GIF version | ||
| Description: The predecessor of a proper class is empty. (Contributed by Scott Fenton, 25-Nov-2024.) |
| Ref | Expression |
|---|---|
| predprc | ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-pred 6277 | . 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋})) | |
| 2 | snprc 4684 | . . . . . . 7 ⊢ (¬ 𝑋 ∈ V ↔ {𝑋} = ∅) | |
| 3 | 2 | biimpi 216 | . . . . . 6 ⊢ (¬ 𝑋 ∈ V → {𝑋} = ∅) |
| 4 | 3 | imaeq2d 6034 | . . . . 5 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅)) |
| 5 | ima0 6051 | . . . . 5 ⊢ (◡𝑅 “ ∅) = ∅ | |
| 6 | 4, 5 | eqtrdi 2781 | . . . 4 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅) |
| 7 | 6 | ineq2d 4186 | . . 3 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅)) |
| 8 | in0 4361 | . . 3 ⊢ (𝐴 ∩ ∅) = ∅ | |
| 9 | 7, 8 | eqtrdi 2781 | . 2 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅) |
| 10 | 1, 9 | eqtrid 2777 | 1 ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1540 ∈ wcel 2109 Vcvv 3450 ∩ cin 3916 ∅c0 4299 {csn 4592 ◡ccnv 5640 “ cima 5644 Predcpred 6276 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pr 5390 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-clab 2709 df-cleq 2722 df-clel 2804 df-rab 3409 df-v 3452 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-nul 4300 df-if 4492 df-sn 4593 df-pr 4595 df-op 4599 df-br 5111 df-opab 5173 df-xp 5647 df-cnv 5649 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 |
| This theorem is referenced by: predres 6315 |
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