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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 13454 | . . . 4 ⊢ (1...𝑁) ⊆ ℤ | |
| 2 | 1 | a1i 11 | . . 3 ⊢ (𝑁 ∈ ℕ → (1...𝑁) ⊆ ℤ) |
| 3 | fzfid 13908 | . . 3 ⊢ (𝑁 ∈ ℕ → (1...𝑁) ∈ Fin) | |
| 4 | 0nelfz1 13471 | . . . 4 ⊢ 0 ∉ (1...𝑁) | |
| 5 | 4 | a1i 11 | . . 3 ⊢ (𝑁 ∈ ℕ → 0 ∉ (1...𝑁)) |
| 6 | 2, 3, 5 | 3jca 1129 | . 2 ⊢ (𝑁 ∈ ℕ → ((1...𝑁) ⊆ ℤ ∧ (1...𝑁) ∈ Fin ∧ 0 ∉ (1...𝑁))) |
| 7 | nnnn0 12420 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ0) | |
| 8 | 7 | faccld 14219 | . . 3 ⊢ (𝑁 ∈ ℕ → (!‘𝑁) ∈ ℕ) |
| 9 | elfznn 13481 | . . . . 5 ⊢ (𝑚 ∈ (1...𝑁) → 𝑚 ∈ ℕ) | |
| 10 | elfzuz3 13449 | . . . . . 6 ⊢ (𝑚 ∈ (1...𝑁) → 𝑁 ∈ (ℤ≥‘𝑚)) | |
| 11 | 10 | adantl 481 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝑚 ∈ (1...𝑁)) → 𝑁 ∈ (ℤ≥‘𝑚)) |
| 12 | dvdsfac 16265 | . . . . 5 ⊢ ((𝑚 ∈ ℕ ∧ 𝑁 ∈ (ℤ≥‘𝑚)) → 𝑚 ∥ (!‘𝑁)) | |
| 13 | 9, 11, 12 | syl2an2 687 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝑚 ∈ (1...𝑁)) → 𝑚 ∥ (!‘𝑁)) |
| 14 | 13 | ralrimiva 3130 | . . 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 16571 | . 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 1087 ∈ wcel 2114 ∉ wnel 3037 ∀wral 3052 ⊆ wss 3903 class class class wbr 5100 ‘cfv 6500 (class class class)co 7368 Fincfn 8895 0cc0 11038 1c1 11039 ≤ cle 11179 ℕcn 12157 ℤcz 12500 ℤ≥cuz 12763 ...cfz 13435 !cfa 14208 ∥ cdvds 16191 lcmclcmf 16528 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-inf2 9562 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-isom 6509 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-sup 9357 df-inf 9358 df-oi 9427 df-card 9863 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-div 11807 df-nn 12158 df-2 12220 df-3 12221 df-n0 12414 df-z 12501 df-uz 12764 df-rp 12918 df-fz 13436 df-fzo 13583 df-seq 13937 df-exp 13997 df-fac 14209 df-hash 14266 df-cj 15034 df-re 15035 df-im 15036 df-sqrt 15170 df-abs 15171 df-clim 15423 df-prod 15839 df-dvds 16192 df-lcmf 16530 |
| This theorem is referenced by: (None) |
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