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| Mirrors > Home > MPE Home > Th. List > gchor | Structured version Visualization version GIF version | ||
| Description: If 𝐴 ≤ 𝐵 ≤ 𝒫 𝐴, and 𝐴 is an infinite GCH-set, then either 𝐴 = 𝐵 or 𝐵 = 𝒫 𝐴 in cardinality. (Contributed by Mario Carneiro, 15-May-2015.) |
| Ref | Expression |
|---|---|
| gchor | ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → (𝐴 ≈ 𝐵 ∨ 𝐵 ≈ 𝒫 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simprr 784 | . . 3 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → 𝐵 ≼ 𝒫 𝐴) | |
| 2 | brdom2 8967 | . . 3 ⊢ (𝐵 ≼ 𝒫 𝐴 ↔ (𝐵 ≺ 𝒫 𝐴 ∨ 𝐵 ≈ 𝒫 𝐴)) | |
| 3 | 1, 2 | sylib 221 | . 2 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → (𝐵 ≺ 𝒫 𝐴 ∨ 𝐵 ≈ 𝒫 𝐴)) |
| 4 | gchen1 10598 | . . . . 5 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≺ 𝒫 𝐴)) → 𝐴 ≈ 𝐵) | |
| 5 | 4 | expr 461 | . . . 4 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ 𝐴 ≼ 𝐵) → (𝐵 ≺ 𝒫 𝐴 → 𝐴 ≈ 𝐵)) |
| 6 | 5 | adantrr 729 | . . 3 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → (𝐵 ≺ 𝒫 𝐴 → 𝐴 ≈ 𝐵)) |
| 7 | 6 | orim1d 981 | . 2 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → ((𝐵 ≺ 𝒫 𝐴 ∨ 𝐵 ≈ 𝒫 𝐴) → (𝐴 ≈ 𝐵 ∨ 𝐵 ≈ 𝒫 𝐴))) |
| 8 | 3, 7 | mpd 16 | 1 ⊢ (((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝒫 𝐴)) → (𝐴 ≈ 𝐵 ∨ 𝐵 ≈ 𝒫 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 ∨ wo 860 ∈ wcel 2145 𝒫 cpw 4558 class class class wbr 5105 ≈ cen 8928 ≼ cdom 8929 ≺ csdm 8930 Fincfn 8931 GCHcgch 10593 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-sep 5251 ax-pr 5395 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-br 5106 df-opab 5168 df-xp 5658 df-rel 5659 df-f1o 6532 df-en 8932 df-dom 8933 df-sdom 8934 df-gch 10594 |
| This theorem is referenced by: gchdomtri 10602 gchpwdom 10643 |
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