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Mirrors > Home > MPE Home > Th. List > Mathboxes > ordeldif | Structured version Visualization version GIF version |
Description: Membership in the difference of ordinals. (Contributed by RP, 15-Jan-2025.) |
Ref | Expression |
---|---|
ordeldif | ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐶 ∈ (𝐴 ∖ 𝐵) ↔ (𝐶 ∈ 𝐴 ∧ 𝐵 ⊆ 𝐶))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldif 3953 | . 2 ⊢ (𝐶 ∈ (𝐴 ∖ 𝐵) ↔ (𝐶 ∈ 𝐴 ∧ ¬ 𝐶 ∈ 𝐵)) | |
2 | simpr 484 | . . . . 5 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → Ord 𝐵) | |
3 | ordelord 6380 | . . . . . 6 ⊢ ((Ord 𝐴 ∧ 𝐶 ∈ 𝐴) → Ord 𝐶) | |
4 | 3 | adantlr 712 | . . . . 5 ⊢ (((Ord 𝐴 ∧ Ord 𝐵) ∧ 𝐶 ∈ 𝐴) → Ord 𝐶) |
5 | ordtri1 6391 | . . . . 5 ⊢ ((Ord 𝐵 ∧ Ord 𝐶) → (𝐵 ⊆ 𝐶 ↔ ¬ 𝐶 ∈ 𝐵)) | |
6 | 2, 4, 5 | syl2an2r 682 | . . . 4 ⊢ (((Ord 𝐴 ∧ Ord 𝐵) ∧ 𝐶 ∈ 𝐴) → (𝐵 ⊆ 𝐶 ↔ ¬ 𝐶 ∈ 𝐵)) |
7 | 6 | bicomd 222 | . . 3 ⊢ (((Ord 𝐴 ∧ Ord 𝐵) ∧ 𝐶 ∈ 𝐴) → (¬ 𝐶 ∈ 𝐵 ↔ 𝐵 ⊆ 𝐶)) |
8 | 7 | pm5.32da 578 | . 2 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐶 ∈ 𝐴 ∧ ¬ 𝐶 ∈ 𝐵) ↔ (𝐶 ∈ 𝐴 ∧ 𝐵 ⊆ 𝐶))) |
9 | 1, 8 | bitrid 283 | 1 ⊢ ((Ord 𝐴 ∧ Ord 𝐵) → (𝐶 ∈ (𝐴 ∖ 𝐵) ↔ (𝐶 ∈ 𝐴 ∧ 𝐵 ⊆ 𝐶))) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∈ wcel 2098 ∖ cdif 3940 ⊆ wss 3943 Ord word 6357 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pr 5420 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-sb 2060 df-clab 2704 df-cleq 2718 df-clel 2804 df-ne 2935 df-ral 3056 df-rex 3065 df-rab 3427 df-v 3470 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-br 5142 df-opab 5204 df-tr 5259 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-ord 6361 |
This theorem is referenced by: tfsconcatlem 42659 tfsconcatfv2 42663 tfsconcatrn 42665 tfsconcatb0 42667 tfsconcatrev 42671 |
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