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Mirrors > Home > MPE Home > Th. List > uz2m1nn | Structured version Visualization version GIF version |
Description: One less than an integer greater than or equal to 2 is a positive integer. (Contributed by Paul Chapman, 17-Nov-2012.) |
Ref | Expression |
---|---|
uz2m1nn | ⊢ (𝑁 ∈ (ℤ≥‘2) → (𝑁 − 1) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eluz2b1 12934 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) ↔ (𝑁 ∈ ℤ ∧ 1 < 𝑁)) | |
2 | 1z 12623 | . . . 4 ⊢ 1 ∈ ℤ | |
3 | znnsub 12639 | . . . 4 ⊢ ((1 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (1 < 𝑁 ↔ (𝑁 − 1) ∈ ℕ)) | |
4 | 2, 3 | mpan 689 | . . 3 ⊢ (𝑁 ∈ ℤ → (1 < 𝑁 ↔ (𝑁 − 1) ∈ ℕ)) |
5 | 4 | biimpa 476 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) → (𝑁 − 1) ∈ ℕ) |
6 | 1, 5 | sylbi 216 | 1 ⊢ (𝑁 ∈ (ℤ≥‘2) → (𝑁 − 1) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∈ wcel 2099 class class class wbr 5148 ‘cfv 6548 (class class class)co 7420 1c1 11140 < clt 11279 − cmin 11475 ℕcn 12243 2c2 12298 ℤcz 12589 ℤ≥cuz 12853 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-nn 12244 df-2 12306 df-n0 12504 df-z 12590 df-uz 12854 |
This theorem is referenced by: nn0ge2m1nnALT 12957 bernneq3 14226 pfxtrcfv0 14677 climcndslem1 15828 exprmfct 16675 oddprm 16779 pockthg 16875 vdwlem5 16954 vdwlem8 16957 efgs1b 19691 efgredlema 19695 wilthlem3 27015 ppiprm 27096 ppinprm 27097 chtprm 27098 chtnprm 27099 lgsval2lem 27253 lgsqrlem2 27293 lgseisenlem1 27321 lgseisenlem3 27323 lgsquadlem3 27328 rplogsumlem1 27430 rplogsumlem2 27431 rpvmasumlem 27433 clwwisshclwwslemlem 29836 umgr2cwwk2dif 29887 psgnfzto1stlem 32834 ballotlemic 34126 ballotlem1c 34127 signstfveq0 34209 fltnltalem 42086 fltnlta 42087 jm3.1lem1 42438 jm3.1lem2 42439 trclfvdecomr 43158 itgsinexp 45343 stirlinglem12 45473 fourierdlem54 45548 fourierdlem102 45596 fourierdlem114 45608 blennngt2o2 47665 |
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