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| 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 8430 | . . 3 ⊢ 1o = suc ∅ | |
| 2 | 1 | fveq2i 6864 | . 2 ⊢ (ℵ‘1o) = (ℵ‘suc ∅) |
| 3 | alephsucpw 10521 | . . 3 ⊢ (ℵ‘suc ∅) ≼ 𝒫 (ℵ‘∅) | |
| 4 | fvex 6874 | . . . . 5 ⊢ (ℵ‘∅) ∈ V | |
| 5 | 4 | pw2en 9049 | . . . 4 ⊢ 𝒫 (ℵ‘∅) ≈ (2o ↑m (ℵ‘∅)) |
| 6 | domen2 9085 | . . . 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 232 | . 2 ⊢ (ℵ‘suc ∅) ≼ (2o ↑m (ℵ‘∅)) |
| 9 | 2, 8 | eqbrtri 5118 | 1 ⊢ (ℵ‘1o) ≼ (2o ↑m (ℵ‘∅)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∅c0 4283 𝒫 cpw 4552 class class class wbr 5097 suc csuc 6342 ‘cfv 6515 (class class class)co 7390 1oc1o 8423 2oc2o 8424 ↑m cmap 8801 ≈ cen 8917 ≼ cdom 8918 ℵcale 9887 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-inf2 9589 ax-ac2 10413 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-int 4903 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-se 5597 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6282 df-ord 6343 df-on 6344 df-lim 6345 df-suc 6346 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-isom 6524 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7841 df-2nd 7965 df-frecs 8255 df-wrecs 8286 df-recs 8335 df-rdg 8374 df-1o 8430 df-2o 8431 df-er 8671 df-map 8803 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-oi 9451 df-har 9498 df-card 9890 df-aleph 9891 df-ac 10065 |
| This theorem is referenced by: (None) |
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