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Mirrors > Home > MPE Home > Th. List > eldifpr | Structured version Visualization version GIF version |
Description: Membership in a set with two elements removed. Similar to eldifsn 4260 and eldiftp 4175. (Contributed by Mario Carneiro, 18-Jul-2017.) |
Ref | Expression |
---|---|
eldifpr | ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶, 𝐷}) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elprg 4144 | . . . . 5 ⊢ (𝐴 ∈ 𝐵 → (𝐴 ∈ {𝐶, 𝐷} ↔ (𝐴 = 𝐶 ∨ 𝐴 = 𝐷))) | |
2 | 1 | notbid 307 | . . . 4 ⊢ (𝐴 ∈ 𝐵 → (¬ 𝐴 ∈ {𝐶, 𝐷} ↔ ¬ (𝐴 = 𝐶 ∨ 𝐴 = 𝐷))) |
3 | neanior 2874 | . . . 4 ⊢ ((𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ↔ ¬ (𝐴 = 𝐶 ∨ 𝐴 = 𝐷)) | |
4 | 2, 3 | syl6bbr 277 | . . 3 ⊢ (𝐴 ∈ 𝐵 → (¬ 𝐴 ∈ {𝐶, 𝐷} ↔ (𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷))) |
5 | 4 | pm5.32i 667 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ {𝐶, 𝐷}) ↔ (𝐴 ∈ 𝐵 ∧ (𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷))) |
6 | eldif 3550 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶, 𝐷}) ↔ (𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ {𝐶, 𝐷})) | |
7 | 3anass 1035 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ↔ (𝐴 ∈ 𝐵 ∧ (𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷))) | |
8 | 5, 6, 7 | 3bitr4i 291 | 1 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶, 𝐷}) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 195 ∨ wo 382 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∖ cdif 3537 {cpr 4127 |
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-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-v 3175 df-dif 3543 df-un 3545 df-sn 4126 df-pr 4128 |
This theorem is referenced by: logbcl 24305 logbid1 24306 logb1 24307 elogb 24308 logbchbase 24309 relogbval 24310 relogbcl 24311 relogbreexp 24313 relogbmul 24315 relogbexp 24318 nnlogbexp 24319 relogbcxp 24323 cxplogb 24324 relogbcxpb 24325 logbmpt 24326 logbfval 24328 rexdifpr 40315 eluz2cnn0n1 42095 rege1logbrege0 42150 relogbmulbexp 42153 relogbdivb 42154 nnpw2blen 42172 |
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