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Mirrors > Home > MPE Home > Th. List > uz3m2nn | Structured version Visualization version GIF version |
Description: An integer greater than or equal to 3 decreased by 2 is a positive integer, analogous to uz2m1nn 12662. (Contributed by Alexander van der Vekens, 17-Sep-2018.) |
Ref | Expression |
---|---|
uz3m2nn | ⊢ (𝑁 ∈ (ℤ≥‘3) → (𝑁 − 2) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eluz2 12587 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘3) ↔ (3 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 3 ≤ 𝑁)) | |
2 | 2lt3 12145 | . . . . . 6 ⊢ 2 < 3 | |
3 | 2re 12047 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
4 | 3re 12053 | . . . . . . 7 ⊢ 3 ∈ ℝ | |
5 | zre 12323 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
6 | ltletr 11067 | . . . . . . 7 ⊢ ((2 ∈ ℝ ∧ 3 ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((2 < 3 ∧ 3 ≤ 𝑁) → 2 < 𝑁)) | |
7 | 3, 4, 5, 6 | mp3an12i 1464 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → ((2 < 3 ∧ 3 ≤ 𝑁) → 2 < 𝑁)) |
8 | 2, 7 | mpani 693 | . . . . 5 ⊢ (𝑁 ∈ ℤ → (3 ≤ 𝑁 → 2 < 𝑁)) |
9 | 8 | imp 407 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 3 ≤ 𝑁) → 2 < 𝑁) |
10 | 9 | 3adant1 1129 | . . 3 ⊢ ((3 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 3 ≤ 𝑁) → 2 < 𝑁) |
11 | 1, 10 | sylbi 216 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘3) → 2 < 𝑁) |
12 | 2nn 12046 | . . 3 ⊢ 2 ∈ ℕ | |
13 | eluzge3nn 12629 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘3) → 𝑁 ∈ ℕ) | |
14 | nnsub 12017 | . . 3 ⊢ ((2 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (2 < 𝑁 ↔ (𝑁 − 2) ∈ ℕ)) | |
15 | 12, 13, 14 | sylancr 587 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘3) → (2 < 𝑁 ↔ (𝑁 − 2) ∈ ℕ)) |
16 | 11, 15 | mpbid 231 | 1 ⊢ (𝑁 ∈ (ℤ≥‘3) → (𝑁 − 2) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 ∈ wcel 2110 class class class wbr 5079 ‘cfv 6432 (class class class)co 7271 ℝcr 10871 < clt 11010 ≤ cle 11011 − cmin 11205 ℕcn 11973 2c2 12028 3c3 12029 ℤcz 12319 ℤ≥cuz 12581 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2015 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2711 ax-sep 5227 ax-nul 5234 ax-pow 5292 ax-pr 5356 ax-un 7582 ax-cnex 10928 ax-resscn 10929 ax-1cn 10930 ax-icn 10931 ax-addcl 10932 ax-addrcl 10933 ax-mulcl 10934 ax-mulrcl 10935 ax-mulcom 10936 ax-addass 10937 ax-mulass 10938 ax-distr 10939 ax-i2m1 10940 ax-1ne0 10941 ax-1rid 10942 ax-rnegex 10943 ax-rrecex 10944 ax-cnre 10945 ax-pre-lttri 10946 ax-pre-lttrn 10947 ax-pre-ltadd 10948 ax-pre-mulgt0 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2072 df-mo 2542 df-eu 2571 df-clab 2718 df-cleq 2732 df-clel 2818 df-nfc 2891 df-ne 2946 df-nel 3052 df-ral 3071 df-rex 3072 df-reu 3073 df-rab 3075 df-v 3433 df-sbc 3721 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4846 df-iun 4932 df-br 5080 df-opab 5142 df-mpt 5163 df-tr 5197 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-pred 6201 df-ord 6268 df-on 6269 df-lim 6270 df-suc 6271 df-iota 6390 df-fun 6434 df-fn 6435 df-f 6436 df-f1 6437 df-fo 6438 df-f1o 6439 df-fv 6440 df-riota 7228 df-ov 7274 df-oprab 7275 df-mpo 7276 df-om 7707 df-2nd 7825 df-frecs 8088 df-wrecs 8119 df-recs 8193 df-rdg 8232 df-er 8481 df-en 8717 df-dom 8718 df-sdom 8719 df-pnf 11012 df-mnf 11013 df-xr 11014 df-ltxr 11015 df-le 11016 df-sub 11207 df-neg 11208 df-nn 11974 df-2 12036 df-3 12037 df-z 12320 df-uz 12582 |
This theorem is referenced by: clwwlknonex2 28469 clwwnrepclwwn 28704 numclwwlk1lem2foa 28714 numclwwlk1lem2fo 28718 numclwlk1lem2 28730 numclwwlk2 28741 numclwwlk3 28745 fltnltalem 40496 |
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