Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > 0elon | Structured version Visualization version GIF version |
Description: The empty set is an ordinal number. Corollary 7N(b) of [Enderton] p. 193. (Contributed by NM, 17-Sep-1993.) |
Ref | Expression |
---|---|
0elon | ⊢ ∅ ∈ On |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ord0 6243 | . 2 ⊢ Ord ∅ | |
2 | 0ex 5185 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | elon 6200 | . 2 ⊢ (∅ ∈ On ↔ Ord ∅) |
4 | 1, 3 | mpbir 234 | 1 ⊢ ∅ ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2112 ∅c0 4223 Ord word 6190 Oncon0 6191 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-11 2160 ax-ext 2708 ax-nul 5184 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-ne 2933 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-br 5040 df-tr 5147 df-po 5453 df-so 5454 df-fr 5494 df-we 5496 df-ord 6194 df-on 6195 |
This theorem is referenced by: inton 6248 onn0 6255 on0eqel 6309 orduninsuc 7600 onzsl 7603 smofvon2 8071 tfrlem16 8107 1on 8187 ordgt0ge1 8202 oa0 8221 om0 8222 oe0m 8223 oe0m0 8225 oe0 8227 oesuclem 8230 omcl 8241 oecl 8242 oa0r 8243 om0r 8244 oaord1 8257 oaword1 8258 oaword2 8259 oawordeu 8261 oa00 8265 odi 8285 oeoa 8303 oeoe 8305 nna0r 8315 nnm0r 8316 card2on 9148 card2inf 9149 harcl 9153 cantnfvalf 9258 rankon 9376 cardon 9525 card0 9539 alephon 9648 alephgeom 9661 alephfplem1 9683 djufi 9765 ttukeylem4 10091 ttukeylem7 10094 cfpwsdom 10163 inar1 10354 rankcf 10356 gruina 10397 bnj168 32375 rdgprc0 33439 naddid1 33522 sltval2 33545 sltsolem1 33564 nosepnelem 33568 nodense 33581 nolt02o 33584 bdayelon 33657 old0 33729 made0 33743 rankeq1o 34159 0hf 34165 onsucconn 34313 onsucsuccmp 34319 finxp1o 35249 finxpreclem4 35251 harn0 40571 aleph1min 40781 |
Copyright terms: Public domain | W3C validator |