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| Description: The rank of a union. Part of Theorem 15.17(iv) of [Monk1] p. 112. |
| Ref | Expression |
|---|---|
| ranksn.1 |
|
| Ref | Expression |
|---|---|
| rankuni |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ranksn.1 |
. . . . 5
| |
| 2 | 1 | uniex 1947 |
. . . 4
|
| 3 | 2 | rankval3 3525 |
. . 3
|
| 4 | fvex 2838 |
. . . . . . . 8
| |
| 5 | 1, 4 | iunon 2947 |
. . . . . . 7
|
| 6 | rankon 3515 |
. . . . . . . 8
| |
| 7 | 6 | a1i 7 |
. . . . . . 7
|
| 8 | 5, 7 | mprg 1249 |
. . . . . 6
|
| 9 | eluni2 1923 |
. . . . . . . 8
| |
| 10 | ax-17 925 |
. . . . . . . . . 10
| |
| 11 | hbiu1 2012 |
. . . . . . . . . 10
| |
| 12 | 10, 11 | hbel 1172 |
. . . . . . . . 9
|
| 13 | ssiun2 2019 |
. . . . . . . . . . 11
| |
| 14 | 13 | sseld 1506 |
. . . . . . . . . 10
|
| 15 | visset 1350 |
. . . . . . . . . . 11
| |
| 16 | 15 | rankel 3524 |
. . . . . . . . . 10
|
| 17 | 14, 16 | syl5 22 |
. . . . . . . . 9
|
| 18 | 12, 17 | r19.23ai 1283 |
. . . . . . . 8
|
| 19 | 9, 18 | sylbi 174 |
. . . . . . 7
|
| 20 | 19 | rgen 1247 |
. . . . . 6
|
| 21 | 8, 20 | pm3.2i 234 |
. . . . 5
|
| 22 | eleq2 1150 |
. . . . . . 7
| |
| 23 | 22 | biraldv 1219 |
. . . . . 6
|
| 24 | 23 | elrab 1422 |
. . . . 5
|
| 25 | 21, 24 | mpbir 165 |
. . . 4
|
| 26 | intss1 1979 |
. . . 4
| |
| 27 | 25, 26 | ax-mp 6 |
. . 3
|
| 28 | 3, 27 | eqsstr 1530 |
. 2
|
| 29 | iunss 2017 |
. . 3
| |
| 30 | elssuni 1940 |
. . . 4
| |
| 31 | 2 | rankss 3531 |
. . . 4
|
| 32 | 30, 31 | syl 12 |
. . 3
|
| 33 | 29, 32 | mprgbir 1250 |
. 2
|
| 34 | 28, 33 | eqssi 1517 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: rankuniss 3534 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 ax-reg 1078 ax-inf 1079 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ne 1192 df-ral 1205 df-rex 1206 df-rab 1208 df-v 1349 df-sbc 1441 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-pss 1494 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-iun 1996 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fv 2438 df-rdg 2970 df-r1 3487 df-rank 3488 |