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| Description: The union of a nonempty class of limit ordinals is a limit ordinal. |
| Ref | Expression |
|---|---|
| limuni3 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | limeq 2966 |
. . . . . . . 8
| |
| 2 | 1 | rcla4v 1876 |
. . . . . . 7
|
| 3 | visset 1816 |
. . . . . . . 8
| |
| 4 | limelon 3038 |
. . . . . . . 8
| |
| 5 | 3, 4 | mpan 697 |
. . . . . . 7
|
| 6 | 2, 5 | syl6com 53 |
. . . . . 6
|
| 7 | 6 | ssrdv 2073 |
. . . . 5
|
| 8 | ssorduni 2999 |
. . . . 5
| |
| 9 | 7, 8 | syl 10 |
. . . 4
|
| 10 | 9 | adantl 390 |
. . 3
|
| 11 | ne0 2292 |
. . . . 5
| |
| 12 | elunii 2512 |
. . . . . . . . 9
| |
| 13 | 12 | expcom 374 |
. . . . . . . 8
|
| 14 | 0ellim 3037 |
. . . . . . . 8
| |
| 15 | 13, 14 | syl5 21 |
. . . . . . 7
|
| 16 | 2, 15 | syld 27 |
. . . . . 6
|
| 17 | 16 | 19.23aiv 1297 |
. . . . 5
|
| 18 | 11, 17 | sylbi 199 |
. . . 4
|
| 19 | 18 | imp 350 |
. . 3
|
| 20 | 1 | rcla4cv 1877 |
. . . . . . . 8
|
| 21 | limsuc 3126 |
. . . . . . . . . . . 12
| |
| 22 | 21 | anbi1d 619 |
. . . . . . . . . . 11
|
| 23 | elunii 2512 |
. . . . . . . . . . 11
| |
| 24 | 22, 23 | syl6bi 214 |
. . . . . . . . . 10
|
| 25 | 24 | exp3a 376 |
. . . . . . . . 9
|
| 26 | 25 | com3r 35 |
. . . . . . . 8
|
| 27 | 20, 26 | sylcom 51 |
. . . . . . 7
|
| 28 | 27 | r19.23adv 1749 |
. . . . . 6
|
| 29 | eluni2 2511 |
. . . . . 6
| |
| 30 | 28, 29 | syl5ib 206 |
. . . . 5
|
| 31 | 30 | r19.21aiv 1716 |
. . . 4
|
| 32 | 31 | adantl 390 |
. . 3
|
| 33 | 10, 19, 32 | 3jca 821 |
. 2
|
| 34 | dflim4 3125 |
. 2
| |
| 35 | 33, 34 | sylibr 200 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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-if 2366 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 |