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Mirrors > Home > MPE Home > Th. List > Mathboxes > elzdif0 | Structured version Visualization version GIF version |
Description: Lemma for qqhval2 29354. (Contributed by Thierry Arnoux, 29-Oct-2017.) |
Ref | Expression |
---|---|
elzdif0 | ⊢ (𝑀 ∈ (ℤ ∖ {0}) → (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifi 3694 | . . 3 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → 𝑀 ∈ ℤ) | |
2 | eldifn 3695 | . . 3 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → ¬ 𝑀 ∈ {0}) | |
3 | elsng 4139 | . . . . 5 ⊢ (𝑀 ∈ ℤ → (𝑀 ∈ {0} ↔ 𝑀 = 0)) | |
4 | 3 | notbid 307 | . . . 4 ⊢ (𝑀 ∈ ℤ → (¬ 𝑀 ∈ {0} ↔ ¬ 𝑀 = 0)) |
5 | 4 | biimpa 500 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ ¬ 𝑀 ∈ {0}) → ¬ 𝑀 = 0) |
6 | 1, 2, 5 | syl2anc 691 | . 2 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → ¬ 𝑀 = 0) |
7 | elz 11256 | . . . . 5 ⊢ (𝑀 ∈ ℤ ↔ (𝑀 ∈ ℝ ∧ (𝑀 = 0 ∨ 𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ))) | |
8 | 1, 7 | sylib 207 | . . . 4 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → (𝑀 ∈ ℝ ∧ (𝑀 = 0 ∨ 𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ))) |
9 | 8 | simprd 478 | . . 3 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → (𝑀 = 0 ∨ 𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ)) |
10 | 3orass 1034 | . . 3 ⊢ ((𝑀 = 0 ∨ 𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ) ↔ (𝑀 = 0 ∨ (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ))) | |
11 | 9, 10 | sylib 207 | . 2 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → (𝑀 = 0 ∨ (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ))) |
12 | orel1 396 | . 2 ⊢ (¬ 𝑀 = 0 → ((𝑀 = 0 ∨ (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ)) → (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ))) | |
13 | 6, 11, 12 | sylc 63 | 1 ⊢ (𝑀 ∈ (ℤ ∖ {0}) → (𝑀 ∈ ℕ ∨ -𝑀 ∈ ℕ)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∨ wo 382 ∧ wa 383 ∨ w3o 1030 = wceq 1475 ∈ wcel 1977 ∖ cdif 3537 {csn 4125 ℝcr 9814 0cc0 9815 -cneg 10146 ℕcn 10897 ℤcz 11254 |
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-3or 1032 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-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-iota 5768 df-fv 5812 df-ov 6552 df-neg 10148 df-z 11255 |
This theorem is referenced by: (None) |
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