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| Description: The class of transfinite cardinals (the range of the aleph function) is a subclass of the class of ordinal numbers. |
| Ref | Expression |
|---|---|
| alephsson |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | isinfcard 4898 |
. . 3
| |
| 2 | cardon 4837 |
. . . . 5
| |
| 3 | eleq1 1537 |
. . . . 5
| |
| 4 | 2, 3 | mpbii 193 |
. . . 4
|
| 5 | 4 | adantl 390 |
. . 3
|
| 6 | 1, 5 | sylbir 201 |
. 2
|
| 7 | 6 | ssriv 2072 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: unialeph 4906 alephfplem3 4909 alephfp 4911 alephfp2 4912 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-9 967 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-rep 2698 ax-sep 2708 ax-nul 2715 ax-pow 2748 ax-pr 2785 ax-un 2872 ax-reg 4602 ax-inf2 4634 ax-ac 4754 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 778 df-3an 779 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-ral 1652 df-rex 1653 df-reu 1654 df-rab 1655 df-v 1815 df-sbc 1945 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-pss 2058 df-nul 2284 df-if 2366 df-pw 2406 df-sn 2416 df-pr 2417 df-tp 2419 df-op 2420 df-uni 2508 df-int 2538 df-iun 2572 df-br 2625 df-opab 2672 df-tr 2686 df-eprel 2838 df-id 2841 df-po 2846 df-so 2856 df-fr 2923 df-we 2940 df-ord 2957 df-on 2958 df-lim 2959 df-suc 2960 df-om 3138 df-xp 3190 df-rel 3191 df-cnv 3192 df-co 3193 df-dm 3194 df-rn 3195 df-res 3196 df-ima 3197 df-fun 3198 df-fn 3199 df-f 3200 df-f1 3201 df-fo 3202 df-f1o 3203 df-fv 3204 df-rdg 3938 df-er 4267 df-en 4374 df-dom 4375 df-sdom 4376 df-fin 4377 df-card 4826 df-aleph 4827 |