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Related theorems Unicode version |
| Description: Ordinal 1 is an ordinal number. |
| Ref | Expression |
|---|---|
| 1on |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1o 4123 |
. 2
| |
| 2 | 0elon 3017 |
. . 3
| |
| 3 | 2 | onsuc 3100 |
. 2
|
| 4 | 1, 3 | eqeltr 1541 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: 2on 4129 oev 4143 oe0 4151 oev2 4152 oesuc 4156 oecl 4162 o1p1e2 4165 om1r 4167 oe1m 4169 omword1 4194 omword2 4195 omlimcl 4199 oneo 4202 oewordi 4208 oelim2 4212 nneob 4245 en2sn 4418 endisj 4423 0sdom1dom 4510 pm54.43 4552 oancom 4613 sucxpdom 4826 cfsuc 4895 uncdadom 4901 cdaun 4902 pm110.643 4903 cdaen 4904 cda1en 4906 cdacomen 4909 cdaassen 4910 mapcdaen 4912 cdafi 4916 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-nul 2705 ax-pow 2737 ax-pr 2774 ax-un 2861 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 775 df-3an 776 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-tp 2411 df-op 2412 df-uni 2499 df-br 2615 df-opab 2662 df-tr 2676 df-eprel 2827 df-po 2835 df-so 2845 df-fr 2912 df-we 2929 df-ord 2946 df-on 2947 df-suc 2949 df-1o 4123 |