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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 6166 onoviun 8276 onnseq 8277 intrnfi 9322 wdomtr 9483 noinfep 9572 wemapwe 9609 scott0s 9803 cplem1 9804 karden 9810 acndom2 9967 dfac5lem3 10038 fin23lem31 10256 fin23lem40 10264 isf34lem5 10291 isf34lem7 10292 isf34lem6 10293 axrrecex 11077 negne0bi 11458 rpnnen1lem4 12921 rpnnen1lem5 12922 fseqsupcl 13930 limsupgre 15434 isercolllem3 15620 rpnnen2lem12 16183 ruclem11 16198 3dvds 16291 prmreclem6 16883 0ram 16982 0ram2 16983 0ramcl 16985 gsumval2 18645 ghmrn 19195 gexex 19819 gsumval3 19873 subdrgint 20771 iinopn 22877 cnconn 23397 1stcfb 23420 qtopeu 23691 fbasrn 23859 alexsublem 24019 evth 24936 minveclem1 25401 minveclem3b 25405 ovollb2 25466 ovolunlem1a 25473 ovolunlem1 25474 ovoliunlem1 25479 ovoliun2 25483 ioombl1lem4 25538 uniioombllem1 25558 uniioombllem2 25560 uniioombllem6 25565 mbfsup 25641 mbfinf 25642 mbflimsup 25643 itg1climres 25691 itg2monolem1 25727 itg2mono 25730 itg2i1fseq2 25733 sincos4thpi 26490 nosepnelem 27657 axlowdimlem13 29037 eulerpath 30326 siii 30939 minvecolem1 30960 bcsiALT 31265 h1de2bi 31640 h1de2ctlem 31641 nmlnopgt0i 32083 wrdpmtrlast 33169 dimval 33760 dimvalfi 33761 rge0scvg 34109 umgracycusgr 35352 cusgracyclt3v 35354 erdszelem5 35393 cvmsss2 35472 elrn3 35960 rankeq1o 36369 ttc0elw 36725 ttc0el 36733 regsfromunir1 36738 fin2so 37942 heicant 37990 scottn0f 38505 psspwb 42683 fnwe2lem2 43497 sqrtcval 44086 |
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