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Mirrors > Home > MPE Home > Th. List > on0eln0 | Structured version Visualization version GIF version |
Description: An ordinal number contains zero iff it is nonzero. (Contributed by NM, 6-Dec-2004.) |
Ref | Expression |
---|---|
on0eln0 | ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ 𝐴 ≠ ∅)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eloni 6201 | . 2 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
2 | ord0eln0 6245 | . 2 ⊢ (Ord 𝐴 → (∅ ∈ 𝐴 ↔ 𝐴 ≠ ∅)) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ 𝐴 ≠ ∅)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∈ wcel 2114 ≠ wne 3016 ∅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-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 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-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-tr 5173 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-ord 6194 df-on 6195 |
This theorem is referenced by: ondif1 8126 oe0lem 8138 oevn0 8140 oa00 8185 omord 8194 om00 8201 om00el 8202 omeulem1 8208 omeulem2 8209 oewordri 8218 oeordsuc 8220 oelim2 8221 oeoa 8223 oeoe 8225 oeeui 8228 omabs 8274 omxpenlem 8618 cantnff 9137 cantnfp1 9144 cantnflem1d 9151 cantnflem1 9152 cantnflem3 9154 cantnflem4 9155 cantnf 9156 cnfcomlem 9162 cnfcom3 9167 r1tskina 10204 onsucconni 33785 onint1 33797 frlmpwfi 39718 |
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