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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 3001 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷) |
| 3 | df-ne 2956 | . 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 1569 ≠ wne 2955 |
| 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 2956 |
| This theorem is used by: necom 3008 neeq1i 3019 neeq2i 3020 neeq12i 3021 rnsnn0 6209 onoviun 8354 onnseq 8355 intrnfi 9411 wdomtr 9572 noinfep 9664 wemapwe 9701 scott0bs 9947 scott0bsOLD 9948 cplem1 9953 cplem1OLD 9954 karden 9962 kardenOLD 9963 acndom2 10136 dfac5lem3 10207 fin23lem31 10424 fin23lem40 10432 isf34lem5 10459 isf34lem7 10460 isf34lem6 10461 axrrecex 11251 negne0bi 11634 rpnnen1lem4 13111 rpnnen1lem5 13112 fseqsupcl 14123 limsupgre 15653 isercolllem3 15839 rpnnen2lem12 16398 ruclem11 16413 3dvds 16506 prmreclem6 17104 0ram 17203 0ram2 17204 0ramcl 17206 gsumval2 18880 ghmrn 19448 gexex 20072 gsumval3 20126 subdrgint 21065 iinopn 23225 cnconn 23745 1stcfb 23768 qtopeu 24040 fbasrn 24208 alexsublem 24368 evth 25285 minveclem1 25750 minveclem3b 25754 ovollb2 25815 ovolunlem1a 25822 ovolunlem1 25823 ovoliunlem1 25828 ovoliun2 25832 ioombl1lem4 25887 uniioombllem1 25907 uniioombllem2 25909 uniioombllem6 25914 mbfsup 25990 mbfinf 25991 mbflimsup 25992 itg1climres 26040 itg2monolem1 26076 itg2mono 26079 itg2i1fseq2 26082 sincos4thpi 26847 nosepnelem 28041 axlowdimlem13 29537 eulerpath 30847 siii 31460 minvecolem1 31481 bcsiALT 31786 h1de2bi 32161 h1de2ctlem 32162 nmlnopgt0i 32604 wrdpmtrlast 33700 dimval 34279 dimvalfi 34280 rge0scvg 34627 rankscott 35806 kardeq0 35880 umgracycusgr 35995 cusgracyclt3v 35997 erdszelem5 36046 cvmsss2 36125 elrn3 36619 rankeq1o 37024 ttc0elw 37407 ttc0el 37415 regsfromunir1 37420 fin2so 38623 heicant 38666 scottn0f 39195 psspwb 43375 sqrtcval 44734 |
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