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Mirrors > Home > ILE Home > Th. List > ssorduni | Unicode version |
Description: The union of a class of ordinal numbers is ordinal. Proposition 7.19 of [TakeutiZaring] p. 40. (Contributed by NM, 30-May-1994.) (Proof shortened by Andrew Salmon, 12-Aug-2011.) |
Ref | Expression |
---|---|
ssorduni |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eluni2 3740 | . . . . 5 | |
2 | ssel 3091 | . . . . . . . . 9 | |
3 | onelss 4309 | . . . . . . . . 9 | |
4 | 2, 3 | syl6 33 | . . . . . . . 8 |
5 | anc2r 326 | . . . . . . . 8 | |
6 | 4, 5 | syl 14 | . . . . . . 7 |
7 | ssuni 3758 | . . . . . . 7 | |
8 | 6, 7 | syl8 71 | . . . . . 6 |
9 | 8 | rexlimdv 2548 | . . . . 5 |
10 | 1, 9 | syl5bi 151 | . . . 4 |
11 | 10 | ralrimiv 2504 | . . 3 |
12 | dftr3 4030 | . . 3 | |
13 | 11, 12 | sylibr 133 | . 2 |
14 | onelon 4306 | . . . . . . 7 | |
15 | 14 | ex 114 | . . . . . 6 |
16 | 2, 15 | syl6 33 | . . . . 5 |
17 | 16 | rexlimdv 2548 | . . . 4 |
18 | 1, 17 | syl5bi 151 | . . 3 |
19 | 18 | ssrdv 3103 | . 2 |
20 | ordon 4402 | . . 3 | |
21 | trssord 4302 | . . . 4 | |
22 | 21 | 3exp 1180 | . . 3 |
23 | 20, 22 | mpii 44 | . 2 |
24 | 13, 19, 23 | sylc 62 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wcel 1480 wral 2416 wrex 2417 wss 3071 cuni 3736 wtr 4026 word 4284 con0 4285 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-in 3077 df-ss 3084 df-uni 3737 df-tr 4027 df-iord 4288 df-on 4290 |
This theorem is referenced by: ssonuni 4404 orduni 4411 tfrlem8 6215 tfrexlem 6231 |
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