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| Mirrors > Home > MPE Home > Th. List > lcmflefac | Structured version Visualization version GIF version | ||
| Description: The least common multiple of all positive integers less than or equal to an integer is less than or equal to the factorial of the integer. (Contributed by AV, 16-Aug-2020.) (Revised by AV, 27-Aug-2020.) |
| Ref | Expression |
|---|---|
| lcmflefac | ⊢ (𝑁 ∈ ℕ → (lcm‘(1...𝑁)) ≤ (!‘𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fzssz 13417 | . . . 4 ⊢ (1...𝑁) ⊆ ℤ | |
| 2 | 1 | a1i 11 | . . 3 ⊢ (𝑁 ∈ ℕ → (1...𝑁) ⊆ ℤ) |
| 3 | fzfid 13868 | . . 3 ⊢ (𝑁 ∈ ℕ → (1...𝑁) ∈ Fin) | |
| 4 | 0nelfz1 13434 | . . . 4 ⊢ 0 ∉ (1...𝑁) | |
| 5 | 4 | a1i 11 | . . 3 ⊢ (𝑁 ∈ ℕ → 0 ∉ (1...𝑁)) |
| 6 | 2, 3, 5 | 3jca 1128 | . 2 ⊢ (𝑁 ∈ ℕ → ((1...𝑁) ⊆ ℤ ∧ (1...𝑁) ∈ Fin ∧ 0 ∉ (1...𝑁))) |
| 7 | nnnn0 12379 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ0) | |
| 8 | 7 | faccld 14179 | . . 3 ⊢ (𝑁 ∈ ℕ → (!‘𝑁) ∈ ℕ) |
| 9 | elfznn 13444 | . . . . 5 ⊢ (𝑚 ∈ (1...𝑁) → 𝑚 ∈ ℕ) | |
| 10 | elfzuz3 13412 | . . . . . 6 ⊢ (𝑚 ∈ (1...𝑁) → 𝑁 ∈ (ℤ≥‘𝑚)) | |
| 11 | 10 | adantl 481 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝑚 ∈ (1...𝑁)) → 𝑁 ∈ (ℤ≥‘𝑚)) |
| 12 | dvdsfac 16224 | . . . . 5 ⊢ ((𝑚 ∈ ℕ ∧ 𝑁 ∈ (ℤ≥‘𝑚)) → 𝑚 ∥ (!‘𝑁)) | |
| 13 | 9, 11, 12 | syl2an2 686 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝑚 ∈ (1...𝑁)) → 𝑚 ∥ (!‘𝑁)) |
| 14 | 13 | ralrimiva 3121 | . . 3 ⊢ (𝑁 ∈ ℕ → ∀𝑚 ∈ (1...𝑁)𝑚 ∥ (!‘𝑁)) |
| 15 | 8, 14 | jca 511 | . 2 ⊢ (𝑁 ∈ ℕ → ((!‘𝑁) ∈ ℕ ∧ ∀𝑚 ∈ (1...𝑁)𝑚 ∥ (!‘𝑁))) |
| 16 | lcmfledvds 16530 | . 2 ⊢ (((1...𝑁) ⊆ ℤ ∧ (1...𝑁) ∈ Fin ∧ 0 ∉ (1...𝑁)) → (((!‘𝑁) ∈ ℕ ∧ ∀𝑚 ∈ (1...𝑁)𝑚 ∥ (!‘𝑁)) → (lcm‘(1...𝑁)) ≤ (!‘𝑁))) | |
| 17 | 6, 15, 16 | sylc 65 | 1 ⊢ (𝑁 ∈ ℕ → (lcm‘(1...𝑁)) ≤ (!‘𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 ∈ wcel 2109 ∉ wnel 3029 ∀wral 3044 ⊆ wss 3899 class class class wbr 5088 ‘cfv 6476 (class class class)co 7340 Fincfn 8863 0cc0 10997 1c1 10998 ≤ cle 11138 ℕcn 12116 ℤcz 12459 ℤ≥cuz 12723 ...cfz 13398 !cfa 14168 ∥ cdvds 16150 lcmclcmf 16487 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5214 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5367 ax-un 7662 ax-inf2 9525 ax-cnex 11053 ax-resscn 11054 ax-1cn 11055 ax-icn 11056 ax-addcl 11057 ax-addrcl 11058 ax-mulcl 11059 ax-mulrcl 11060 ax-mulcom 11061 ax-addass 11062 ax-mulass 11063 ax-distr 11064 ax-i2m1 11065 ax-1ne0 11066 ax-1rid 11067 ax-rnegex 11068 ax-rrecex 11069 ax-cnre 11070 ax-pre-lttri 11071 ax-pre-lttrn 11072 ax-pre-ltadd 11073 ax-pre-mulgt0 11074 ax-pre-sup 11075 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3343 df-reu 3344 df-rab 3393 df-v 3435 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-int 4895 df-iun 4940 df-br 5089 df-opab 5151 df-mpt 5170 df-tr 5196 df-id 5508 df-eprel 5513 df-po 5521 df-so 5522 df-fr 5566 df-se 5567 df-we 5568 df-xp 5619 df-rel 5620 df-cnv 5621 df-co 5622 df-dm 5623 df-rn 5624 df-res 5625 df-ima 5626 df-pred 6243 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-isom 6485 df-riota 7297 df-ov 7343 df-oprab 7344 df-mpo 7345 df-om 7791 df-1st 7915 df-2nd 7916 df-frecs 8205 df-wrecs 8236 df-recs 8285 df-rdg 8323 df-1o 8379 df-er 8616 df-en 8864 df-dom 8865 df-sdom 8866 df-fin 8867 df-sup 9320 df-inf 9321 df-oi 9390 df-card 9823 df-pnf 11139 df-mnf 11140 df-xr 11141 df-ltxr 11142 df-le 11143 df-sub 11337 df-neg 11338 df-div 11766 df-nn 12117 df-2 12179 df-3 12180 df-n0 12373 df-z 12460 df-uz 12724 df-rp 12882 df-fz 13399 df-fzo 13546 df-seq 13897 df-exp 13957 df-fac 14169 df-hash 14226 df-cj 14993 df-re 14994 df-im 14995 df-sqrt 15129 df-abs 15130 df-clim 15382 df-prod 15798 df-dvds 16151 df-lcmf 16489 |
| This theorem is referenced by: (None) |
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