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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 8975 | . . 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 10606 | . . . . 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 2149 𝒫 cpw 4564 class class class wbr 5110 ≈ cen 8936 ≼ cdom 8937 ≺ csdm 8938 Fincfn 8939 GCHcgch 10601 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-sep 5258 ax-pr 5402 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-br 5111 df-opab 5175 df-xp 5665 df-rel 5666 df-f1o 6540 df-en 8940 df-dom 8941 df-sdom 8942 df-gch 10602 |
| This theorem is referenced by: gchdomtri 10610 gchpwdom 10651 |
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