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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 8494 | . 2 class 1o | |
| 2 | c0 4281 | . . 3 class ∅ | |
| 3 | 2 | csuc 6379 | . 2 class suc ∅ |
| 4 | 1, 3 | wceq 1570 | 1 wff 1o = suc ∅ |
| Colors of variables: wff setvar class |
| This definition is used by: df1o2 8508 1on 8514 1n0 8520 ordgt0ge1 8526 oa1suc 8564 o2p2e4 8574 om1 8575 oe1 8577 oelim2 8629 nnecl 8647 1onnALT 8675 omabs 8685 nnm1 8686 0sdom1domALT 9263 brttrcl2 9739 ssttrcl 9740 ttrcltr 9741 ttrclss 9745 dmttrcl 9746 rnttrcl 9747 ttrclselem2 9751 ackbij1lem14 10334 aleph1 10680 cfpwsdom 10693 nlt1pi 11015 indpi 11016 hash1 14572 aleph1re 16439 ltsval2 28040 ltssolem1 28059 nosepnelem 28063 nolt02o 28079 bday1 28227 cuteq1 28230 om2noseqlt 28712 bdaypw2n0bndlem 28876 bnj168 35428 r11 35806 gdlopcfv1 35971 satfv1 36294 fmla1 36318 rankeq1o 37109 finxp1o 38506 finxpreclem4 38508 finxp00 38516 ordeldif1o 44452 onov0suclim 44466 omabs2 44524 tfsconcatb0 44536 nlim1NEW 44633 aleph1min 44748 clsk1indlem1 45235 |
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