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Mirrors > Home > MPE Home > Th. List > ordunidif | Structured version Visualization version Unicode version |
Description: The union of an ordinal stays the same if a subset equal to one of its elements is removed. (Contributed by NM, 10-Dec-2004.) |
Ref | Expression |
---|---|
ordunidif |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordelon 5747 | . . . . . . . 8 | |
2 | onelss 5766 | . . . . . . . 8 | |
3 | 1, 2 | syl 17 | . . . . . . 7 |
4 | eloni 5733 | . . . . . . . . . . 11 | |
5 | ordirr 5741 | . . . . . . . . . . 11 | |
6 | 4, 5 | syl 17 | . . . . . . . . . 10 |
7 | eldif 3584 | . . . . . . . . . . 11 | |
8 | 7 | simplbi2 655 | . . . . . . . . . 10 |
9 | 6, 8 | syl5 34 | . . . . . . . . 9 |
10 | 9 | adantl 482 | . . . . . . . 8 |
11 | 1, 10 | mpd 15 | . . . . . . 7 |
12 | 3, 11 | jctild 566 | . . . . . 6 |
13 | 12 | adantr 481 | . . . . 5 |
14 | sseq2 3627 | . . . . . 6 | |
15 | 14 | rspcev 3309 | . . . . 5 |
16 | 13, 15 | syl6 35 | . . . 4 |
17 | eldif 3584 | . . . . . . . . 9 | |
18 | 17 | biimpri 218 | . . . . . . . 8 |
19 | ssid 3624 | . . . . . . . 8 | |
20 | 18, 19 | jctir 561 | . . . . . . 7 |
21 | 20 | ex 450 | . . . . . 6 |
22 | sseq2 3627 | . . . . . . 7 | |
23 | 22 | rspcev 3309 | . . . . . 6 |
24 | 21, 23 | syl6 35 | . . . . 5 |
25 | 24 | adantl 482 | . . . 4 |
26 | 16, 25 | pm2.61d 170 | . . 3 |
27 | 26 | ralrimiva 2966 | . 2 |
28 | unidif 4471 | . 2 | |
29 | 27, 28 | syl 17 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wa 384 wceq 1483 wcel 1990 wral 2912 wrex 2913 cdif 3571 wss 3574 cuni 4436 word 5722 con0 5723 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-tr 4753 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-ord 5726 df-on 5727 |
This theorem is referenced by: (None) |
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