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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 2979 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷) |
| 3 | df-ne 2934 | . 2 ⊢ (𝐶 ≠ 𝐷 ↔ ¬ 𝐶 = 𝐷) | |
| 4 | 2, 3 | bitr4i 278 | 1 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ↔ wb 206 = wceq 1542 ≠ wne 2933 |
| 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 207 df-ne 2934 |
| This theorem is referenced by: necom 2986 neeq1i 2997 neeq2i 2998 neeq12i 2999 rnsnn0 6174 onoviun 8285 onnseq 8286 intrnfi 9331 wdomtr 9492 noinfep 9581 wemapwe 9618 scott0s 9812 cplem1 9813 karden 9819 acndom2 9976 dfac5lem3 10047 fin23lem31 10265 fin23lem40 10273 isf34lem5 10300 isf34lem7 10301 isf34lem6 10302 axrrecex 11086 negne0bi 11466 rpnnen1lem4 12905 rpnnen1lem5 12906 fseqsupcl 13912 limsupgre 15416 isercolllem3 15602 rpnnen2lem12 16162 ruclem11 16177 3dvds 16270 prmreclem6 16861 0ram 16960 0ram2 16961 0ramcl 16963 gsumval2 18623 ghmrn 19170 gexex 19794 gsumval3 19848 subdrgint 20748 iinopn 22858 cnconn 23378 1stcfb 23401 qtopeu 23672 fbasrn 23840 alexsublem 24000 evth 24926 minveclem1 25392 minveclem3b 25396 ovollb2 25458 ovolunlem1a 25465 ovolunlem1 25466 ovoliunlem1 25471 ovoliun2 25475 ioombl1lem4 25530 uniioombllem1 25550 uniioombllem2 25552 uniioombllem6 25557 mbfsup 25633 mbfinf 25634 mbflimsup 25635 itg1climres 25683 itg2monolem1 25719 itg2mono 25722 itg2i1fseq2 25725 sincos4thpi 26490 nosepnelem 27659 axlowdimlem13 29039 eulerpath 30328 siii 30940 minvecolem1 30961 bcsiALT 31266 h1de2bi 31641 h1de2ctlem 31642 nmlnopgt0i 32084 wrdpmtrlast 33186 dimval 33777 dimvalfi 33778 rge0scvg 34126 umgracycusgr 35367 cusgracyclt3v 35369 erdszelem5 35408 cvmsss2 35487 elrn3 35975 rankeq1o 36384 regsfromunir1 36689 fin2so 37855 heicant 37903 scottn0f 38418 psspwb 42597 fnwe2lem2 43405 sqrtcval 43994 |
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