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| Mirrors > Home > MPE Home > Th. List > df-1o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 1. Definition 2.1 of [Schloeder] p. 4. (Contributed by NM, 29-Oct-1995.) |
| Ref | Expression |
|---|---|
| df-1o | ⊢ 1o = suc ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c1o 8444 | . 2 class 1o | |
| 2 | c0 4285 | . . 3 class ∅ | |
| 3 | 2 | csuc 6362 | . 2 class suc ∅ |
| 4 | 1, 3 | wceq 1569 | 1 wff 1o = suc ∅ |
| Colors of variables: wff setvar class |
| This definition is used by: df1o2 8458 1on 8464 1n0 8470 ordgt0ge1 8476 oa1suc 8514 o2p2e4 8524 om1 8525 oe1 8527 oelim2 8579 nnecl 8597 1onnALT 8625 omabs 8635 nnm1 8636 0sdom1domALT 9205 brttrcl2 9681 ssttrcl 9682 ttrcltr 9683 ttrclss 9687 dmttrcl 9688 rnttrcl 9689 ttrclselem2 9693 ackbij1lem14 10222 aleph1 10562 cfpwsdom 10575 nlt1pi 10897 indpi 10898 hash1 14447 aleph1re 16307 ltsval2 27831 ltssolem1 27850 nosepnelem 27854 nolt02o 27870 bday1 28018 cuteq1 28021 om2noseqlt 28503 bdaypw2n0bndlem 28667 bnj168 35128 r11 35496 satfv1 35863 fmla1 35887 rankeq1o 36671 finxp1o 38066 finxpreclem4 38068 finxp00 38076 ordeldif1o 44015 onov0suclim 44029 omabs2 44087 tfsconcatb0 44099 nlim1NEW 44196 aleph1min 44311 clsk1indlem1 44799 |
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