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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 5211 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | elon 6200 | . 2 ⊢ (∅ ∈ On ↔ Ord ∅) |
4 | 1, 3 | mpbir 233 | 1 ⊢ ∅ ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 ∅c0 4291 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 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-nul 5210 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 df-pw 4541 df-uni 4839 df-tr 5173 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-ord 6194 df-on 6195 |
This theorem is referenced by: inton 6248 onn0 6255 on0eqel 6308 orduninsuc 7558 onzsl 7561 smofvon2 7993 tfrlem16 8029 1on 8109 ordgt0ge1 8122 oa0 8141 om0 8142 oe0m 8143 oe0m0 8145 oe0 8147 oesuclem 8150 omcl 8161 oecl 8162 oa0r 8163 om0r 8164 oaord1 8177 oaword1 8178 oaword2 8179 oawordeu 8181 oa00 8185 odi 8205 oeoa 8223 oeoe 8225 nna0r 8235 nnm0r 8236 card2on 9018 card2inf 9019 harcl 9025 cantnfvalf 9128 rankon 9224 cardon 9373 card0 9387 alephon 9495 alephgeom 9508 alephfplem1 9530 djufi 9612 ttukeylem4 9934 ttukeylem7 9937 cfpwsdom 10006 inar1 10197 rankcf 10199 gruina 10240 bnj168 32000 rdgprc0 33038 sltval2 33163 sltsolem1 33180 nosepnelem 33184 nodense 33196 nolt02o 33199 bdayelon 33246 rankeq1o 33632 0hf 33638 onsucconn 33786 onsucsuccmp 33792 finxp1o 34676 finxpreclem4 34678 harn0 39751 aleph1min 39965 |
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