| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| 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 3136 |
. 2
| |
| 2 | ordeleqon 2985 |
. . 3
| |
| 3 | ordirr 2961 |
. . . . . 6
| |
| 4 | 1, 3 | ax-mp 7 |
. . . . 5
|
| 5 | elomg 3130 |
. . . . . 6
| |
| 6 | ordtri1 2975 |
. . . . . . . . . . . . . . 15
| |
| 7 | 6 | adantr 389 |
. . . . . . . . . . . . . 14
|
| 8 | ordsseleq 2971 |
. . . . . . . . . . . . . . . 16
| |
| 9 | 8 | biimpd 153 |
. . . . . . . . . . . . . . 15
|
| 10 | nnlim 3139 |
. . . . . . . . . . . . . . . . 17
| |
| 11 | 10 | a1i 8 |
. . . . . . . . . . . . . . . 16
|
| 12 | limeq 2955 |
. . . . . . . . . . . . . . . . . . 19
| |
| 13 | 12 | biimpd 153 |
. . . . . . . . . . . . . . . . . 18
|
| 14 | 13 | con3d 95 |
. . . . . . . . . . . . . . . . 17
|
| 15 | 14 | com12 11 |
. . . . . . . . . . . . . . . 16
|
| 16 | 11, 15 | jaod 424 |
. . . . . . . . . . . . . . 15
|
| 17 | 9, 16 | sylan9 468 |
. . . . . . . . . . . . . 14
|
| 18 | 7, 17 | sylbird 205 |
. . . . . . . . . . . . 13
|
| 19 | 18 | a3d 75 |
. . . . . . . . . . . 12
|
| 20 | 1, 19 | mpanl2 706 |
. . . . . . . . . . 11
|
| 21 | limord 3023 |
. . . . . . . . . . 11
| |
| 22 | 20, 21 | sylan 448 |
. . . . . . . . . 10
|
| 23 | 22 | ex 373 |
. . . . . . . . 9
|
| 24 | 23 | pm2.43b 67 |
. . . . . . . 8
|
| 25 | 24 | 19.21aiv 1284 |
. . . . . . 7
|
| 26 | 25, 1 | jctil 292 |
. . . . . 6
|
| 27 | 5, 26 | syl5bir 210 |
. . . . 5
|
| 28 | 4, 27 | mt3i 113 |
. . . 4
|
| 29 | limon 3089 |
. . . . 5
| |
| 30 | limeq 2955 |
. . . . 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 3142 peano1 3144 ssnlim 3162 oaabslem 4241 oaabs 4242 infeq5 4601 elom3 4611 omenps 4616 omensuc 4617 cardlim 4831 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-nul 2705 ax-pow 2737 ax-pr 2774 ax-un 2861 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 775 df-3an 776 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-tp 2411 df-op 2412 df-uni 2499 df-br 2615 df-opab 2662 df-tr 2676 df-eprel 2827 df-po 2835 df-so 2845 df-fr 2912 df-we 2929 df-ord 2946 df-on 2947 df-lim 2948 df-suc 2949 df-om 3127 |