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Mirrors > Home > MPE Home > Th. List > Mathboxes > bccl2d | Structured version Visualization version GIF version |
Description: Closure of the binomial coefficient, a deduction version. (Contributed by metakunt, 12-May-2024.) |
Ref | Expression |
---|---|
bccl2d.1 | ⊢ (𝜑 → 𝑁 ∈ ℕ) |
bccl2d.2 | ⊢ (𝜑 → 𝐾 ∈ ℕ0) |
bccl2d.3 | ⊢ (𝜑 → 𝐾 ≤ 𝑁) |
Ref | Expression |
---|---|
bccl2d | ⊢ (𝜑 → (𝑁C𝐾) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bccl2d.2 | . . . . 5 ⊢ (𝜑 → 𝐾 ∈ ℕ0) | |
2 | 1 | nn0zd 12497 | . . . 4 ⊢ (𝜑 → 𝐾 ∈ ℤ) |
3 | 1 | nn0ge0d 12369 | . . . 4 ⊢ (𝜑 → 0 ≤ 𝐾) |
4 | bccl2d.3 | . . . 4 ⊢ (𝜑 → 𝐾 ≤ 𝑁) | |
5 | 2, 3, 4 | 3jca 1127 | . . 3 ⊢ (𝜑 → (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) |
6 | bccl2d.1 | . . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℕ) | |
7 | 6 | nnzd 12498 | . . . 4 ⊢ (𝜑 → 𝑁 ∈ ℤ) |
8 | 0z 12403 | . . . . 5 ⊢ 0 ∈ ℤ | |
9 | elfz1 13317 | . . . . 5 ⊢ ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 ∈ (0...𝑁) ↔ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) | |
10 | 8, 9 | mpan 687 | . . . 4 ⊢ (𝑁 ∈ ℤ → (𝐾 ∈ (0...𝑁) ↔ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) |
11 | 7, 10 | syl 17 | . . 3 ⊢ (𝜑 → (𝐾 ∈ (0...𝑁) ↔ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) |
12 | 5, 11 | mpbird 256 | . 2 ⊢ (𝜑 → 𝐾 ∈ (0...𝑁)) |
13 | bccl2 14110 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ) | |
14 | 12, 13 | syl 17 | 1 ⊢ (𝜑 → (𝑁C𝐾) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ w3a 1086 ∈ wcel 2105 class class class wbr 5087 (class class class)co 7315 0cc0 10944 ≤ cle 11083 ℕcn 12046 ℕ0cn0 12306 ℤcz 12392 ...cfz 13312 Ccbc 14089 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2708 ax-sep 5238 ax-nul 5245 ax-pow 5303 ax-pr 5367 ax-un 7628 ax-cnex 11000 ax-resscn 11001 ax-1cn 11002 ax-icn 11003 ax-addcl 11004 ax-addrcl 11005 ax-mulcl 11006 ax-mulrcl 11007 ax-mulcom 11008 ax-addass 11009 ax-mulass 11010 ax-distr 11011 ax-i2m1 11012 ax-1ne0 11013 ax-1rid 11014 ax-rnegex 11015 ax-rrecex 11016 ax-cnre 11017 ax-pre-lttri 11018 ax-pre-lttrn 11019 ax-pre-ltadd 11020 ax-pre-mulgt0 11021 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2815 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3350 df-reu 3351 df-rab 3405 df-v 3443 df-sbc 3727 df-csb 3843 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3916 df-nul 4268 df-if 4472 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-uni 4851 df-iun 4939 df-br 5088 df-opab 5150 df-mpt 5171 df-tr 5205 df-id 5507 df-eprel 5513 df-po 5521 df-so 5522 df-fr 5562 df-we 5564 df-xp 5613 df-rel 5614 df-cnv 5615 df-co 5616 df-dm 5617 df-rn 5618 df-res 5619 df-ima 5620 df-pred 6224 df-ord 6291 df-on 6292 df-lim 6293 df-suc 6294 df-iota 6417 df-fun 6467 df-fn 6468 df-f 6469 df-f1 6470 df-fo 6471 df-f1o 6472 df-fv 6473 df-riota 7272 df-ov 7318 df-oprab 7319 df-mpo 7320 df-om 7758 df-1st 7876 df-2nd 7877 df-frecs 8144 df-wrecs 8175 df-recs 8249 df-rdg 8288 df-er 8546 df-en 8782 df-dom 8783 df-sdom 8784 df-pnf 11084 df-mnf 11085 df-xr 11086 df-ltxr 11087 df-le 11088 df-sub 11280 df-neg 11281 df-div 11706 df-nn 12047 df-n0 12307 df-z 12393 df-uz 12656 df-rp 12804 df-fz 13313 df-seq 13795 df-fac 14061 df-bc 14090 |
This theorem is referenced by: lcmineqlem11 40252 lcmineqlem15 40256 lcmineqlem16 40257 lcmineqlem19 40260 lcmineqlem20 40261 |
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