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Theorem gchinf 10651

Description: An infinite GCH-set is Dedekind-infinite. (Contributed by Mario Carneiro, 31-May-2015.)

**Assertion**
Ref	Expression
gchinf	⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → ω ≼ 𝐴)

**Proof of Theorem gchinf**
Step	Hyp	Ref	Expression
1		gchdju1 10650	. . 3 ⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → (𝐴 ⊔ 1_o) ≈ 𝐴)
2	1	ensymd 9000	. 2 ⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → 𝐴 ≈ (𝐴 ⊔ 1_o))
3		isfin4-2 10308	. . . 4 ⊢ (𝐴 ∈ GCH → (𝐴 ∈ Fin^IV ↔ ¬ ω ≼ 𝐴))
4	3	adantr 480	. . 3 ⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → (𝐴 ∈ Fin^IV ↔ ¬ ω ≼ 𝐴))
5		isfin4p1 10309	. . . 4 ⊢ (𝐴 ∈ Fin^IV ↔ 𝐴 ≺ (𝐴 ⊔ 1_o))
6		sdomnen 8976	. . . 4 ⊢ (𝐴 ≺ (𝐴 ⊔ 1_o) → ¬ 𝐴 ≈ (𝐴 ⊔ 1_o))
7	5, 6	sylbi 216	. . 3 ⊢ (𝐴 ∈ Fin^IV → ¬ 𝐴 ≈ (𝐴 ⊔ 1_o))
8	4, 7	syl6bir 254	. 2 ⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → (¬ ω ≼ 𝐴 → ¬ 𝐴 ≈ (𝐴 ⊔ 1_o)))
9	2, 8	mt4d 117	1 ⊢ ((𝐴 ∈ GCH ∧ ¬ 𝐴 ∈ Fin) → ω ≼ 𝐴)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∈ wcel 2098 class class class wbr 5141 ωcom 7851 1_oc1o 8457 ≈ cen 8935 ≼ cdom 8936 ≺ csdm 8937 Fincfn 8938 ⊔ cdju 9892 Fin^IVcfin4 10274 GCHcgch 10614

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-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-inf2 9635

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-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 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-tp 4628 df-op 4630 df-uni 4903 df-int 4944 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-se 5625 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6293 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-isom 6545 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8264 df-wrecs 8295 df-recs 8369 df-rdg 8408 df-1o 8464 df-2o 8465 df-er 8702 df-map 8821 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-oi 9504 df-dju 9895 df-card 9933 df-fin4 10281 df-gch 10615

This theorem is referenced by: gchdjuidm 10662 gchxpidm 10663 gchina 10693

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