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Mirrors > Home > MPE Home > Th. List > preddowncl | Structured version Visualization version Unicode version |
Description: A property of classes that are downward closed under predecessor. (Contributed by Scott Fenton, 13-Apr-2011.) |
Ref | Expression |
---|---|
preddowncl |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2689 | . . . . 5 | |
2 | predeq3 5684 | . . . . . 6 | |
3 | predeq3 5684 | . . . . . 6 | |
4 | 2, 3 | eqeq12d 2637 | . . . . 5 |
5 | 1, 4 | imbi12d 334 | . . . 4 |
6 | 5 | imbi2d 330 | . . 3 |
7 | predpredss 5686 | . . . . . 6 | |
8 | 7 | ad2antrr 762 | . . . . 5 |
9 | predeq3 5684 | . . . . . . . . . . . 12 | |
10 | 9 | sseq1d 3632 | . . . . . . . . . . 11 |
11 | 10 | rspccva 3308 | . . . . . . . . . 10 |
12 | 11 | sseld 3602 | . . . . . . . . 9 |
13 | vex 3203 | . . . . . . . . . . 11 | |
14 | 13 | elpredim 5692 | . . . . . . . . . 10 |
15 | 14 | a1i 11 | . . . . . . . . 9 |
16 | 12, 15 | jcad 555 | . . . . . . . 8 |
17 | vex 3203 | . . . . . . . . . . 11 | |
18 | 17 | elpred 5693 | . . . . . . . . . 10 |
19 | 18 | imbi2d 330 | . . . . . . . . 9 |
20 | 19 | adantl 482 | . . . . . . . 8 |
21 | 16, 20 | mpbird 247 | . . . . . . 7 |
22 | 21 | ssrdv 3609 | . . . . . 6 |
23 | 22 | adantll 750 | . . . . 5 |
24 | 8, 23 | eqssd 3620 | . . . 4 |
25 | 24 | ex 450 | . . 3 |
26 | 6, 25 | vtoclg 3266 | . 2 |
27 | 26 | pm2.43b 55 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 wceq 1483 wcel 1990 wral 2912 wss 3574 class class class wbr 4653 cpred 5679 |
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-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-br 4654 df-opab 4713 df-xp 5120 df-cnv 5122 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 |
This theorem is referenced by: wfrlem4 7418 frrlem4 31783 |
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