Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > ordirr | Structured version Visualization version GIF version |
Description: No ordinal class is a member of itself. In other words, the membership relation is irreflexive on ordinal classes. Theorem 2.2(i) of [BellMachover] p. 469, generalized to classes. We prove this without invoking the Axiom of Regularity. (Contributed by NM, 2-Jan-1994.) |
Ref | Expression |
---|---|
ordirr | ⊢ (Ord 𝐴 → ¬ 𝐴 ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordfr 6206 | . 2 ⊢ (Ord 𝐴 → E Fr 𝐴) | |
2 | efrirr 5536 | . 2 ⊢ ( E Fr 𝐴 → ¬ 𝐴 ∈ 𝐴) | |
3 | 1, 2 | syl 17 | 1 ⊢ (Ord 𝐴 → ¬ 𝐴 ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2114 E cep 5464 Fr wfr 5511 Ord word 6190 |
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-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-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-br 5067 df-opab 5129 df-eprel 5465 df-fr 5514 df-we 5516 df-ord 6194 |
This theorem is referenced by: nordeq 6210 ordn2lp 6211 ordtri3or 6223 ordtri1 6224 ordtri3 6227 orddisj 6229 ordunidif 6239 ordnbtwn 6281 onirri 6297 onssneli 6300 onprc 7499 nlimsucg 7557 nnlim 7593 limom 7595 smo11 8001 smoord 8002 tfrlem13 8026 omopth2 8210 limensuci 8693 infensuc 8695 ordtypelem9 8990 cantnfp1lem3 9143 cantnfp1 9144 oemapvali 9147 tskwe 9379 dif1card 9436 dju1p1e2ALT 9600 pwsdompw 9626 cflim2 9685 fin23lem24 9744 fin23lem26 9747 axdc3lem4 9875 ttukeylem7 9937 canthp1lem2 10075 inar1 10197 gruina 10240 grur1 10242 addnidpi 10323 fzennn 13337 hashp1i 13765 soseq 33096 noseponlem 33171 noextend 33173 noextenddif 33175 noextendlt 33176 noextendgt 33177 fvnobday 33183 nosepssdm 33190 nosupbnd1lem3 33210 nosupbnd1lem5 33212 nosupbnd2lem1 33215 noetalem3 33219 sucneqond 34649 |
Copyright terms: Public domain | W3C validator |