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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 6245 | . 2 ⊢ Ord ∅ | |
2 | 0ex 5213 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | elon 6202 | . 2 ⊢ (∅ ∈ On ↔ Ord ∅) |
4 | 1, 3 | mpbir 233 | 1 ⊢ ∅ ∈ On |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 ∅c0 4293 Ord word 6192 Oncon0 6193 |
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 2795 ax-nul 5212 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-dif 3941 df-in 3945 df-ss 3954 df-nul 4294 df-pw 4543 df-uni 4841 df-tr 5175 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-ord 6196 df-on 6197 |
This theorem is referenced by: inton 6250 onn0 6257 on0eqel 6310 orduninsuc 7560 onzsl 7563 smofvon2 7995 tfrlem16 8031 1on 8111 ordgt0ge1 8124 oa0 8143 om0 8144 oe0m 8145 oe0m0 8147 oe0 8149 oesuclem 8152 omcl 8163 oecl 8164 oa0r 8165 om0r 8166 oaord1 8179 oaword1 8180 oaword2 8181 oawordeu 8183 oa00 8187 odi 8207 oeoa 8225 oeoe 8227 nna0r 8237 nnm0r 8238 card2on 9020 card2inf 9021 harcl 9027 cantnfvalf 9130 rankon 9226 cardon 9375 card0 9389 alephon 9497 alephgeom 9510 alephfplem1 9532 djufi 9614 ttukeylem4 9936 ttukeylem7 9939 cfpwsdom 10008 inar1 10199 rankcf 10201 gruina 10242 bnj168 32002 rdgprc0 33040 sltval2 33165 sltsolem1 33182 nosepnelem 33186 nodense 33198 nolt02o 33201 bdayelon 33248 rankeq1o 33634 0hf 33640 onsucconn 33788 onsucsuccmp 33794 finxp1o 34675 finxpreclem4 34677 harn0 39709 aleph1min 39923 |
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