| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: Ordinal 1 is an ordinal number. |
| Ref | Expression |
|---|---|
| 1on |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1o 4133 |
. 2
| |
| 2 | 0elon 3022 |
. . 3
| |
| 3 | 2 | onsuc 3105 |
. 2
|
| 4 | 1, 3 | eqeltr 1544 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: 2on 4139 oev 4153 oe0 4161 oev2 4162 oesuc 4166 oecl 4172 o1p1e2 4175 om1r 4177 oe1m 4179 omword1 4204 omword2 4205 omlimcl 4209 oneo 4212 oewordi 4218 oelim2 4222 nneob 4255 en2sn 4431 endisj 4437 0sdom1dom 4525 pm54.43 4572 oancom 4633 sucxpdom 4846 cfsuc 4915 uncdadom 4921 cdaun 4922 pm110.643 4923 cdaen 4924 cda1en 4926 cdacomen 4929 cdaassen 4930 mapcdaen 4932 cdafi 4936 |
| 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-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-sep 2703 ax-nul 2710 ax-pow 2742 ax-pr 2779 ax-un 2866 |
| 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-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-tp 2415 df-op 2416 df-uni 2504 df-br 2620 df-opab 2667 df-tr 2681 df-eprel 2832 df-po 2840 df-so 2850 df-fr 2917 df-we 2934 df-ord 2951 df-on 2952 df-suc 2954 df-1o 4133 |