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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 6205 | . 2 ⊢ (Ord 𝐴 → E Fr 𝐴) | |
2 | efrirr 5535 | . 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 2110 E cep 5463 Fr wfr 5510 Ord word 6189 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pr 5329 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 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 3772 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4567 df-pr 4569 df-op 4573 df-br 5066 df-opab 5128 df-eprel 5464 df-fr 5513 df-we 5515 df-ord 6193 |
This theorem is referenced by: nordeq 6209 ordn2lp 6210 ordtri3or 6222 ordtri1 6223 ordtri3 6226 orddisj 6228 ordunidif 6238 ordnbtwn 6280 onirri 6296 onssneli 6299 onprc 7498 nlimsucg 7556 nnlim 7592 limom 7594 smo11 8000 smoord 8001 tfrlem13 8025 omopth2 8209 limensuci 8692 infensuc 8694 ordtypelem9 8989 cantnfp1lem3 9142 cantnfp1 9143 oemapvali 9146 tskwe 9378 dif1card 9435 dju1p1e2ALT 9599 pwsdompw 9625 cflim2 9684 fin23lem24 9743 fin23lem26 9746 axdc3lem4 9874 ttukeylem7 9936 canthp1lem2 10074 inar1 10196 gruina 10239 grur1 10241 addnidpi 10322 fzennn 13335 hashp1i 13763 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 34645 |
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