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Mirrors > Home > ILE Home > Th. List > eldif | GIF version |
Description: Expansion of membership in a class difference. (Contributed by NM, 29-Apr-1994.) |
Ref | Expression |
---|---|
eldif | ⊢ (𝐴 ∈ (𝐵 ∖ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2610 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ 𝐶) → 𝐴 ∈ V) | |
2 | elex 2610 | . . 3 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ V) | |
3 | 2 | adantr 270 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶) → 𝐴 ∈ V) |
4 | eleq1 2141 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
5 | eleq1 2141 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐶 ↔ 𝐴 ∈ 𝐶)) | |
6 | 5 | notbid 624 | . . . 4 ⊢ (𝑥 = 𝐴 → (¬ 𝑥 ∈ 𝐶 ↔ ¬ 𝐴 ∈ 𝐶)) |
7 | 4, 6 | anbi12d 456 | . . 3 ⊢ (𝑥 = 𝐴 → ((𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶))) |
8 | df-dif 2975 | . . 3 ⊢ (𝐵 ∖ 𝐶) = {𝑥 ∣ (𝑥 ∈ 𝐵 ∧ ¬ 𝑥 ∈ 𝐶)} | |
9 | 7, 8 | elab2g 2740 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ (𝐵 ∖ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶))) |
10 | 1, 3, 9 | pm5.21nii 652 | 1 ⊢ (𝐴 ∈ (𝐵 ∖ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∧ wa 102 ↔ wb 103 = wceq 1284 ∈ wcel 1433 Vcvv 2601 ∖ cdif 2970 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-dif 2975 |
This theorem is referenced by: eldifd 2983 eldifad 2984 eldifbd 2985 difeqri 3092 eldifi 3094 eldifn 3095 difdif 3097 ddifstab 3104 ssconb 3105 sscon 3106 ssdif 3107 raldifb 3112 ssddif 3198 unssdif 3199 inssdif 3200 difin 3201 unssin 3203 inssun 3204 invdif 3206 indif 3207 difundi 3216 difindiss 3218 indifdir 3220 undif3ss 3225 difin2 3226 symdifxor 3230 dfnul2 3253 reldisj 3295 disj3 3296 undif4 3306 ssdif0im 3308 inssdif0im 3311 ssundifim 3326 eldifsn 3517 difprsnss 3524 iundif2ss 3743 iindif2m 3745 brdif 3833 unidif0 3941 eldifpw 4226 elirr 4284 en2lp 4297 difopab 4487 intirr 4731 cnvdif 4750 imadiflem 4998 imadif 4999 xrlenlt 7177 nzadd 8403 irradd 8731 irrmul 8732 fzdifsuc 9098 |
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