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Mirrors > Home > MPE Home > Th. List > alephgeom | Structured version Visualization version GIF version |
Description: Every aleph is greater than or equal to the set of natural numbers. (Contributed by NM, 11-Nov-2003.) |
Ref | Expression |
---|---|
alephgeom | ⊢ (𝐴 ∈ On ↔ ω ⊆ (ℵ‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | aleph0 9478 | . . 3 ⊢ (ℵ‘∅) = ω | |
2 | 0ss 4336 | . . . 4 ⊢ ∅ ⊆ 𝐴 | |
3 | 0elon 6230 | . . . . 5 ⊢ ∅ ∈ On | |
4 | alephord3 9490 | . . . . 5 ⊢ ((∅ ∈ On ∧ 𝐴 ∈ On) → (∅ ⊆ 𝐴 ↔ (ℵ‘∅) ⊆ (ℵ‘𝐴))) | |
5 | 3, 4 | mpan 688 | . . . 4 ⊢ (𝐴 ∈ On → (∅ ⊆ 𝐴 ↔ (ℵ‘∅) ⊆ (ℵ‘𝐴))) |
6 | 2, 5 | mpbii 235 | . . 3 ⊢ (𝐴 ∈ On → (ℵ‘∅) ⊆ (ℵ‘𝐴)) |
7 | 1, 6 | eqsstrrid 4004 | . 2 ⊢ (𝐴 ∈ On → ω ⊆ (ℵ‘𝐴)) |
8 | peano1 7587 | . . . . . 6 ⊢ ∅ ∈ ω | |
9 | ordom 7575 | . . . . . . . 8 ⊢ Ord ω | |
10 | ord0 6229 | . . . . . . . 8 ⊢ Ord ∅ | |
11 | ordtri1 6210 | . . . . . . . 8 ⊢ ((Ord ω ∧ Ord ∅) → (ω ⊆ ∅ ↔ ¬ ∅ ∈ ω)) | |
12 | 9, 10, 11 | mp2an 690 | . . . . . . 7 ⊢ (ω ⊆ ∅ ↔ ¬ ∅ ∈ ω) |
13 | 12 | con2bii 360 | . . . . . 6 ⊢ (∅ ∈ ω ↔ ¬ ω ⊆ ∅) |
14 | 8, 13 | mpbi 232 | . . . . 5 ⊢ ¬ ω ⊆ ∅ |
15 | ndmfv 6686 | . . . . . 6 ⊢ (¬ 𝐴 ∈ dom ℵ → (ℵ‘𝐴) = ∅) | |
16 | 15 | sseq2d 3987 | . . . . 5 ⊢ (¬ 𝐴 ∈ dom ℵ → (ω ⊆ (ℵ‘𝐴) ↔ ω ⊆ ∅)) |
17 | 14, 16 | mtbiri 329 | . . . 4 ⊢ (¬ 𝐴 ∈ dom ℵ → ¬ ω ⊆ (ℵ‘𝐴)) |
18 | 17 | con4i 114 | . . 3 ⊢ (ω ⊆ (ℵ‘𝐴) → 𝐴 ∈ dom ℵ) |
19 | alephfnon 9477 | . . . 4 ⊢ ℵ Fn On | |
20 | fndm 6441 | . . . 4 ⊢ (ℵ Fn On → dom ℵ = On) | |
21 | 19, 20 | ax-mp 5 | . . 3 ⊢ dom ℵ = On |
22 | 18, 21 | eleqtrdi 2923 | . 2 ⊢ (ω ⊆ (ℵ‘𝐴) → 𝐴 ∈ On) |
23 | 7, 22 | impbii 211 | 1 ⊢ (𝐴 ∈ On ↔ ω ⊆ (ℵ‘𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 208 = wceq 1537 ∈ wcel 2114 ⊆ wss 3924 ∅c0 4279 dom cdm 5541 Ord word 6176 Oncon0 6177 Fn wfn 6336 ‘cfv 6341 ωcom 7566 ℵcale 9351 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5176 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-inf2 9090 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-int 4863 df-iun 4907 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-se 5501 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-lim 6182 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-isom 6350 df-riota 7100 df-om 7567 df-wrecs 7933 df-recs 7994 df-rdg 8032 df-er 8275 df-en 8496 df-dom 8497 df-sdom 8498 df-fin 8499 df-oi 8960 df-har 9008 df-card 9354 df-aleph 9355 |
This theorem is referenced by: alephislim 9495 cardalephex 9502 isinfcard 9504 alephval3 9522 alephval2 9980 alephadd 9985 alephmul 9986 alephexp1 9987 alephsuc3 9988 alephexp2 9989 alephreg 9990 pwcfsdom 9991 cfpwsdom 9992 gchaleph 10079 gchaleph2 10080 |
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