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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 3064 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷) |
3 | df-ne 3019 | . 2 ⊢ (𝐶 ≠ 𝐷 ↔ ¬ 𝐶 = 𝐷) | |
4 | 2, 3 | bitr4i 280 | 1 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 208 = wceq 1537 ≠ wne 3018 |
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 209 df-ne 3019 |
This theorem is referenced by: necom 3071 neeq1i 3082 neeq2i 3083 neeq12i 3084 rnsnn0 6067 onoviun 7982 onnseq 7983 intrnfi 8882 wdomtr 9041 noinfep 9125 wemapwe 9162 scott0s 9319 cplem1 9320 karden 9326 acndom2 9482 dfac5lem3 9553 fin23lem31 9767 fin23lem40 9775 isf34lem5 9802 isf34lem7 9803 isf34lem6 9804 axrrecex 10587 negne0bi 10961 rpnnen1lem4 12382 rpnnen1lem5 12383 fseqsupcl 13348 limsupgre 14840 isercolllem3 15025 rpnnen2lem12 15580 ruclem11 15595 3dvds 15682 prmreclem6 16259 0ram 16358 0ram2 16359 0ramcl 16361 gsumval2 17898 ghmrn 18373 gexex 18975 gsumval3 19029 subdrgint 19584 iinopn 21512 cnconn 22032 1stcfb 22055 qtopeu 22326 fbasrn 22494 alexsublem 22654 evth 23565 minveclem1 24029 minveclem3b 24033 ovollb2 24092 ovolunlem1a 24099 ovolunlem1 24100 ovoliunlem1 24105 ovoliun2 24109 ioombl1lem4 24164 uniioombllem1 24184 uniioombllem2 24186 uniioombllem6 24191 mbfsup 24267 mbfinf 24268 mbflimsup 24269 itg1climres 24317 itg2monolem1 24353 itg2mono 24356 itg2i1fseq2 24359 sincos4thpi 25101 axlowdimlem13 26742 eulerpath 28022 siii 28632 minvecolem1 28653 bcsiALT 28958 h1de2bi 29333 h1de2ctlem 29334 nmlnopgt0i 29776 dimval 31003 dimvalfi 31004 rge0scvg 31194 umgracycusgr 32403 cusgracyclt3v 32405 erdszelem5 32444 cvmsss2 32523 elrn3 33000 nosepnelem 33186 rankeq1o 33634 fin2so 34881 heicant 34929 scottn0f 35450 psspwb 39121 fnwe2lem2 39658 |
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