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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 3003 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷) |
| 3 | df-ne 2958 | . 2 ⊢ (𝐶 ≠ 𝐷 ↔ ¬ 𝐶 = 𝐷) | |
| 4 | 2, 3 | bitr4i 281 | 1 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ↔ wb 209 = wceq 1570 ≠ wne 2957 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
| This proof depends on definitions: df-bi 210 df-ne 2958 |
| This theorem is used by: necom 3010 neeq1i 3021 neeq2i 3022 neeq12i 3023 rnsnn0 6208 onoviun 8336 onnseq 8337 intrnfi 9390 wdomtr 9551 noinfep 9643 wemapwe 9680 scott0bs 9887 scott0bsOLD 9888 cplem1 9893 cplem1OLD 9894 karden 9902 kardenOLD 9903 acndom2 10061 dfac5lem3 10132 fin23lem31 10349 fin23lem40 10357 isf34lem5 10384 isf34lem7 10385 isf34lem6 10386 axrrecex 11176 negne0bi 11559 rpnnen1lem4 13034 rpnnen1lem5 13035 fseqsupcl 14045 limsupgre 15572 isercolllem3 15758 rpnnen2lem12 16319 ruclem11 16334 3dvds 16427 prmreclem6 17019 0ram 17118 0ram2 17119 0ramcl 17121 gsumval2 18794 ghmrn 19362 gexex 19986 gsumval3 20040 subdrgint 20975 iinopn 23133 cnconn 23653 1stcfb 23676 qtopeu 23948 fbasrn 24116 alexsublem 24276 evth 25193 minveclem1 25658 minveclem3b 25662 ovollb2 25723 ovolunlem1a 25730 ovolunlem1 25731 ovoliunlem1 25736 ovoliun2 25740 ioombl1lem4 25795 uniioombllem1 25815 uniioombllem2 25817 uniioombllem6 25822 mbfsup 25898 mbfinf 25899 mbflimsup 25900 itg1climres 25948 itg2monolem1 25984 itg2mono 25987 itg2i1fseq2 25990 sincos4thpi 26758 nosepnelem 27923 axlowdimlem13 29419 eulerpath 30729 siii 31342 minvecolem1 31363 bcsiALT 31668 h1de2bi 32043 h1de2ctlem 32044 nmlnopgt0i 32486 wrdpmtrlast 33541 dimval 34119 dimvalfi 34120 rge0scvg 34467 rankscott 35643 kardeq0 35690 umgracycusgr 35741 cusgracyclt3v 35743 erdszelem5 35782 cvmsss2 35861 elrn3 36349 rankeq1o 36759 ttc0elw 37154 ttc0el 37162 regsfromunir1 37167 fin2so 38369 heicant 38412 scottn0f 38926 psspwb 43106 fnwe2lem2 43900 sqrtcval 44489 |
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