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Mirrors > Home > MPE Home > Th. List > wfisg | Structured version Visualization version Unicode version |
Description: Well-Founded Induction Schema. If a property passes from all elements less than of a well-founded class to itself (induction hypothesis), then the property holds for all elements of . (Contributed by Scott Fenton, 11-Feb-2011.) |
Ref | Expression |
---|---|
wfisg.1 |
Ref | Expression |
---|---|
wfisg | Se |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssrab2 3687 | . . 3 | |
2 | dfss3 3592 | . . . . . . . 8 | |
3 | nfcv 2764 | . . . . . . . . . . 11 | |
4 | 3 | elrabsf 3474 | . . . . . . . . . 10 |
5 | 4 | simprbi 480 | . . . . . . . . 9 |
6 | 5 | ralimi 2952 | . . . . . . . 8 |
7 | 2, 6 | sylbi 207 | . . . . . . 7 |
8 | nfv 1843 | . . . . . . . . 9 | |
9 | nfcv 2764 | . . . . . . . . . . 11 | |
10 | nfsbc1v 3455 | . . . . . . . . . . 11 | |
11 | 9, 10 | nfral 2945 | . . . . . . . . . 10 |
12 | nfsbc1v 3455 | . . . . . . . . . 10 | |
13 | 11, 12 | nfim 1825 | . . . . . . . . 9 |
14 | 8, 13 | nfim 1825 | . . . . . . . 8 |
15 | eleq1 2689 | . . . . . . . . 9 | |
16 | predeq3 5684 | . . . . . . . . . . 11 | |
17 | 16 | raleqdv 3144 | . . . . . . . . . 10 |
18 | sbceq1a 3446 | . . . . . . . . . 10 | |
19 | 17, 18 | imbi12d 334 | . . . . . . . . 9 |
20 | 15, 19 | imbi12d 334 | . . . . . . . 8 |
21 | wfisg.1 | . . . . . . . 8 | |
22 | 14, 20, 21 | chvar 2262 | . . . . . . 7 |
23 | 7, 22 | syl5 34 | . . . . . 6 |
24 | 23 | anc2li 580 | . . . . 5 |
25 | 3 | elrabsf 3474 | . . . . 5 |
26 | 24, 25 | syl6ibr 242 | . . . 4 |
27 | 26 | rgen 2922 | . . 3 |
28 | wfi 5713 | . . 3 Se | |
29 | 1, 27, 28 | mpanr12 721 | . 2 Se |
30 | rabid2 3118 | . 2 | |
31 | 29, 30 | sylib 208 | 1 Se |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wa 384 wceq 1483 wcel 1990 wral 2912 crab 2916 wsbc 3435 wss 3574 Se wse 5071 wwe 5072 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-3or 1038 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-reu 2919 df-rmo 2920 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-po 5035 df-so 5036 df-fr 5073 df-se 5074 df-we 5075 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: wfis 5716 wfis2fg 5717 |
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