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| Description: Omega is a limit ordinal. Theorem 2.8 of [BellMachover] p. 473. Our proof, however, does not require the Axiom of Infinity. |
| Ref | Expression |
|---|---|
| limom |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordom 3147 |
. 2
| |
| 2 | ordeleqon 2996 |
. . 3
| |
| 3 | ordirr 2972 |
. . . . . 6
| |
| 4 | 1, 3 | ax-mp 7 |
. . . . 5
|
| 5 | elomg 3141 |
. . . . . 6
| |
| 6 | ordtri1 2986 |
. . . . . . . . . . . . . . 15
| |
| 7 | 6 | adantr 391 |
. . . . . . . . . . . . . 14
|
| 8 | ordsseleq 2982 |
. . . . . . . . . . . . . . . 16
| |
| 9 | 8 | biimpd 153 |
. . . . . . . . . . . . . . 15
|
| 10 | nnlim 3150 |
. . . . . . . . . . . . . . . . 17
| |
| 11 | 10 | a1i 8 |
. . . . . . . . . . . . . . . 16
|
| 12 | limeq 2966 |
. . . . . . . . . . . . . . . . . . 19
| |
| 13 | 12 | biimpd 153 |
. . . . . . . . . . . . . . . . . 18
|
| 14 | 13 | con3d 95 |
. . . . . . . . . . . . . . . . 17
|
| 15 | 14 | com12 11 |
. . . . . . . . . . . . . . . 16
|
| 16 | 11, 15 | jaod 426 |
. . . . . . . . . . . . . . 15
|
| 17 | 9, 16 | sylan9 470 |
. . . . . . . . . . . . . 14
|
| 18 | 7, 17 | sylbird 205 |
. . . . . . . . . . . . 13
|
| 19 | 18 | a3d 75 |
. . . . . . . . . . . 12
|
| 20 | 1, 19 | mpanl2 709 |
. . . . . . . . . . 11
|
| 21 | limord 3034 |
. . . . . . . . . . 11
| |
| 22 | 20, 21 | sylan 450 |
. . . . . . . . . 10
|
| 23 | 22 | ex 373 |
. . . . . . . . 9
|
| 24 | 23 | pm2.43b 67 |
. . . . . . . 8
|
| 25 | 24 | 19.21aiv 1288 |
. . . . . . 7
|
| 26 | 25, 1 | jctil 292 |
. . . . . 6
|
| 27 | 5, 26 | syl5bir 210 |
. . . . 5
|
| 28 | 4, 27 | mt3i 113 |
. . . 4
|
| 29 | limon 3100 |
. . . . 5
| |
| 30 | limeq 2966 |
. . . . 5
| |
| 31 | 29, 30 | mpbiri 194 |
. . . 4
|
| 32 | 28, 31 | jaoi 341 |
. . 3
|
| 33 | 2, 32 | sylbi 199 |
. 2
|
| 34 | 1, 33 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: peano2b 3153 peano1 3155 ssnlim 3173 oaabslem 4257 oaabs 4258 infeq5 4630 elom3 4640 omenps 4646 omensuc 4647 cardlim 4862 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-nul 2715 ax-pow 2748 ax-pr 2785 ax-un 2872 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 778 df-3an 779 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-ral 1652 df-rex 1653 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-tp 2419 df-op 2420 df-uni 2508 df-br 2625 df-opab 2672 df-tr 2686 df-eprel 2838 df-po 2846 df-so 2856 df-fr 2923 df-we 2940 df-ord 2957 df-on 2958 df-lim 2959 df-suc 2960 df-om 3138 |