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| Mirrors > Home > MPE Home > Th. List > necon3bii | Structured version Visualization version GIF version | ||
| Description: Inference from equality to inequality. (Contributed by NM, 23-Feb-2005.) |
| Ref | Expression |
|---|---|
| necon3bii.1 | ⊢ (𝐴 = 𝐵 ↔ 𝐶 = 𝐷) |
| Ref | Expression |
|---|---|
| necon3bii | ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | necon3bii.1 | . . 3 ⊢ (𝐴 = 𝐵 ↔ 𝐶 = 𝐷) | |
| 2 | 1 | necon3abii 3006 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷) |
| 3 | df-ne 2961 | . 2 ⊢ (𝐶 ≠ 𝐷 ↔ ¬ 𝐶 = 𝐷) | |
| 4 | 2, 3 | bitr4i 281 | 1 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ↔ wb 209 = wceq 1563 ≠ wne 2960 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
| This theorem depends on definitions: df-bi 210 df-ne 2961 |
| This theorem is referenced by: necom 3013 neeq1i 3024 neeq2i 3025 neeq12i 3026 rnsnn0 6198 onoviun 8318 onnseq 8319 intrnfi 9364 wdomtr 9525 noinfep 9617 wemapwe 9654 scott0s 9850 cplem1 9863 karden 9869 acndom2 10026 dfac5lem3 10097 fin23lem31 10315 fin23lem40 10323 isf34lem5 10350 isf34lem7 10351 isf34lem6 10352 axrrecex 11136 negne0bi 11519 rpnnen1lem4 12992 rpnnen1lem5 12993 fseqsupcl 14001 limsupgre 15520 isercolllem3 15706 rpnnen2lem12 16269 ruclem11 16284 3dvds 16377 prmreclem6 16969 0ram 17068 0ram2 17069 0ramcl 17071 gsumval2 18732 ghmrn 19287 gexex 19911 gsumval3 19965 subdrgint 20872 iinopn 23016 cnconn 23536 1stcfb 23559 qtopeu 23830 fbasrn 23998 alexsublem 24158 evth 25075 minveclem1 25540 minveclem3b 25544 ovollb2 25605 ovolunlem1a 25612 ovolunlem1 25613 ovoliunlem1 25618 ovoliun2 25622 ioombl1lem4 25677 uniioombllem1 25697 uniioombllem2 25699 uniioombllem6 25704 mbfsup 25780 mbfinf 25781 mbflimsup 25782 itg1climres 25830 itg2monolem1 25866 itg2mono 25869 itg2i1fseq2 25872 sincos4thpi 26632 nosepnelem 27797 axlowdimlem13 29209 eulerpath 30497 siii 31110 minvecolem1 31131 bcsiALT 31436 h1de2bi 31811 h1de2ctlem 31812 nmlnopgt0i 32254 wrdpmtrlast 33321 dimval 33903 dimvalfi 33904 rge0scvg 34251 umgracycusgr 35512 cusgracyclt3v 35514 erdszelem5 35553 cvmsss2 35632 elrn3 36120 rankeq1o 36529 ttc0elw 36895 ttc0el 36903 regsfromunir1 36908 fin2so 38113 heicant 38161 scottn0f 38676 psspwb 42854 fnwe2lem2 43635 sqrtcval 44224 |
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