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Mirrors > Home > MPE Home > Th. List > difeq2 | Structured version Visualization version GIF version |
Description: Equality theorem for class difference. (Contributed by NM, 10-Feb-1997.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
Ref | Expression |
---|---|
difeq2 | ⊢ (𝐴 = 𝐵 → (𝐶 ∖ 𝐴) = (𝐶 ∖ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq2 2677 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
2 | 1 | notbid 307 | . . 3 ⊢ (𝐴 = 𝐵 → (¬ 𝑥 ∈ 𝐴 ↔ ¬ 𝑥 ∈ 𝐵)) |
3 | 2 | rabbidv 3164 | . 2 ⊢ (𝐴 = 𝐵 → {𝑥 ∈ 𝐶 ∣ ¬ 𝑥 ∈ 𝐴} = {𝑥 ∈ 𝐶 ∣ ¬ 𝑥 ∈ 𝐵}) |
4 | dfdif2 3549 | . 2 ⊢ (𝐶 ∖ 𝐴) = {𝑥 ∈ 𝐶 ∣ ¬ 𝑥 ∈ 𝐴} | |
5 | dfdif2 3549 | . 2 ⊢ (𝐶 ∖ 𝐵) = {𝑥 ∈ 𝐶 ∣ ¬ 𝑥 ∈ 𝐵} | |
6 | 3, 4, 5 | 3eqtr4g 2669 | 1 ⊢ (𝐴 = 𝐵 → (𝐶 ∖ 𝐴) = (𝐶 ∖ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1475 ∈ wcel 1977 {crab 2900 ∖ cdif 3537 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-ral 2901 df-rab 2905 df-dif 3543 |
This theorem is referenced by: difeq12 3685 difeq2i 3687 difeq2d 3690 symdifeq1 3808 disjdif2 3999 ssdifeq0 4003 sorpsscmpl 6846 2oconcl 7470 oev 7481 sbthlem2 7956 sbth 7965 infdiffi 8438 fin1ai 8998 fin23lem7 9021 fin23lem11 9022 compsscnv 9076 isf34lem1 9077 compss 9081 isf34lem4 9082 fin1a2lem7 9111 pwfseqlem4a 9362 pwfseqlem4 9363 efgmval 17948 efgi 17955 frgpuptinv 18007 gsumcllem 18132 gsumzaddlem 18144 fctop 20618 cctop 20620 iscld 20641 clsval2 20664 opncldf1 20698 opncldf2 20699 opncldf3 20700 indiscld 20705 mretopd 20706 restcld 20786 lecldbas 20833 pnrmopn 20957 hauscmplem 21019 elpt 21185 elptr 21186 cfinfil 21507 csdfil 21508 ufilss 21519 filufint 21534 cfinufil 21542 ufinffr 21543 ufilen 21544 prdsxmslem2 22144 lebnumlem1 22568 bcth3 22936 ismbl 23101 ishpg 25451 frgrawopreg1 26577 frgrawopreg2 26578 disjdifprg 28770 0elsiga 29504 prsiga 29521 sigaclci 29522 difelsiga 29523 unelldsys 29548 sigapildsyslem 29551 sigapildsys 29552 ldgenpisyslem1 29553 isros 29558 unelros 29561 difelros 29562 inelsros 29568 diffiunisros 29569 rossros 29570 elcarsg 29694 ballotlemfval 29878 ballotlemgval 29912 kur14lem1 30442 topdifinffinlem 32371 topdifinffin 32372 dssmapfv3d 37333 dssmapnvod 37334 clsk3nimkb 37358 ntrclsneine0lem 37382 ntrclsk2 37386 ntrclskb 37387 ntrclsk13 37389 ntrclsk4 37390 prsal 39214 saldifcl 39215 salexct 39228 salexct2 39233 salexct3 39236 salgencntex 39237 salgensscntex 39238 caragenel 39385 frgrwopreg1 41487 frgrwopreg2 41488 |
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