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Mirrors > Home > ILE Home > Th. List > ordsucss | Unicode version |
Description: The successor of an element of an ordinal class is a subset of it. (Contributed by NM, 21-Jun-1998.) |
Ref | Expression |
---|---|
ordsucss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordtr 4295 | . 2 | |
2 | trss 4030 | . . . . 5 | |
3 | snssi 3659 | . . . . . 6 | |
4 | 3 | a1i 9 | . . . . 5 |
5 | 2, 4 | jcad 305 | . . . 4 |
6 | unss 3245 | . . . 4 | |
7 | 5, 6 | syl6ib 160 | . . 3 |
8 | df-suc 4288 | . . . 4 | |
9 | 8 | sseq1i 3118 | . . 3 |
10 | 7, 9 | syl6ibr 161 | . 2 |
11 | 1, 10 | syl 14 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wcel 1480 cun 3064 wss 3066 csn 3522 wtr 4021 word 4279 csuc 4282 |
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 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-sn 3528 df-uni 3732 df-tr 4022 df-iord 4283 df-suc 4288 |
This theorem is referenced by: ordelsuc 4416 tfrlemibfn 6218 tfr1onlembfn 6234 tfrcllembfn 6247 sucinc2 6335 nndomo 6751 prarloclemn 7300 ennnfonelemhom 11917 ennnfonelemrn 11921 |
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