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| Description: The elements of a proper class have unbounded rank. Exercise 2 of [TakeutiZaring] p. 80. |
| Ref | Expression |
|---|---|
| unbndrank |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rankon 4671 |
. . . . . . . 8
| |
| 2 | ontri1 2981 |
. . . . . . . 8
| |
| 3 | 1, 2 | mpan 695 |
. . . . . . 7
|
| 4 | 3 | ralbidv 1663 |
. . . . . 6
|
| 5 | ralnex 1653 |
. . . . . 6
| |
| 6 | 4, 5 | syl6bb 536 |
. . . . 5
|
| 7 | 6 | rexbiia 1674 |
. . . 4
|
| 8 | rexnal 1654 |
. . . 4
| |
| 9 | 7, 8 | bitr 173 |
. . 3
|
| 10 | bndrank 4682 |
. . 3
| |
| 11 | 9, 10 | sylbir 201 |
. 2
|
| 12 | 11 | con1i 96 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-9 965 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-rep 2693 ax-sep 2703 ax-nul 2710 ax-pow 2742 ax-pr 2779 ax-un 2866 ax-reg 4593 ax-inf2 4625 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 776 df-3an 777 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-ral 1649 df-rex 1650 df-rab 1652 df-v 1812 df-sbc 1942 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-if 2362 df-pw 2402 df-sn 2412 df-pr 2413 df-tp 2415 df-op 2416 df-uni 2504 df-int 2534 df-iun 2568 df-br 2620 df-opab 2667 df-tr 2681 df-eprel 2832 df-id 2835 df-po 2840 df-so 2850 df-fr 2917 df-we 2934 df-ord 2951 df-on 2952 df-lim 2953 df-suc 2954 df-om 3132 df-xp 3184 df-rel 3185 df-cnv 3186 df-co 3187 df-dm 3188 df-rn 3189 df-res 3190 df-ima 3191 df-fun 3192 df-fn 3193 df-fv 3198 df-rdg 3932 df-r1 4643 df-rank 4644 |