| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > aleph1 | Structured version Visualization version GIF version | ||
| Description: The set exponentiation of 2 to the aleph-zero has cardinality of at least aleph-one. (If we were to assume the Continuum Hypothesis, their cardinalities would be the same.) (Contributed by NM, 7-Jul-2004.) |
| Ref | Expression |
|---|---|
| aleph1 | ⊢ (ℵ‘1o) ≼ (2o ↑m (ℵ‘∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1o 8441 | . . 3 ⊢ 1o = suc ∅ | |
| 2 | 1 | fveq2i 6874 | . 2 ⊢ (ℵ‘1o) = (ℵ‘suc ∅) |
| 3 | alephsucpw 10543 | . . 3 ⊢ (ℵ‘suc ∅) ≼ 𝒫 (ℵ‘∅) | |
| 4 | fvex 6884 | . . . . 5 ⊢ (ℵ‘∅) ∈ V | |
| 5 | 4 | pw2en 9060 | . . . 4 ⊢ 𝒫 (ℵ‘∅) ≈ (2o ↑m (ℵ‘∅)) |
| 6 | domen2 9096 | . . . 4 ⊢ (𝒫 (ℵ‘∅) ≈ (2o ↑m (ℵ‘∅)) → ((ℵ‘suc ∅) ≼ 𝒫 (ℵ‘∅) ↔ (ℵ‘suc ∅) ≼ (2o ↑m (ℵ‘∅)))) | |
| 7 | 5, 6 | ax-mp 5 | . . 3 ⊢ ((ℵ‘suc ∅) ≼ 𝒫 (ℵ‘∅) ↔ (ℵ‘suc ∅) ≼ (2o ↑m (ℵ‘∅))) |
| 8 | 3, 7 | mpbi 233 | . 2 ⊢ (ℵ‘suc ∅) ≼ (2o ↑m (ℵ‘∅)) |
| 9 | 2, 8 | eqbrtri 5125 | 1 ⊢ (ℵ‘1o) ≼ (2o ↑m (ℵ‘∅)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 ∅c0 4288 𝒫 cpw 4558 class class class wbr 5104 suc csuc 6351 ‘cfv 6525 (class class class)co 7400 1oc1o 8434 2oc2o 8435 ↑m cmap 8812 ≈ cen 8928 ≼ cdom 8929 ℵcale 9910 |
| 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-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-rep 5231 ax-sep 5250 ax-nul 5260 ax-pow 5326 ax-pr 5394 ax-un 7722 ax-inf2 9598 ax-ac2 10435 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3080 df-rex 3090 df-rmo 3370 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4908 df-iun 4953 df-br 5105 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6291 df-ord 6352 df-on 6353 df-lim 6354 df-suc 6355 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-isom 6534 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-1o 8441 df-2o 8442 df-er 8682 df-map 8814 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-oi 9460 df-har 9507 df-card 9913 df-aleph 9914 df-ac 10088 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |