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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 12646 | . . . 4 ⊢ (𝜑 → 𝐾 ∈ ℤ) |
3 | 1 | nn0ge0d 12597 | . . . 4 ⊢ (𝜑 → 0 ≤ 𝐾) |
4 | bccl2d.3 | . . . 4 ⊢ (𝜑 → 𝐾 ≤ 𝑁) | |
5 | 2, 3, 4 | 3jca 1129 | . . 3 ⊢ (𝜑 → (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁)) |
6 | bccl2d.1 | . . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℕ) | |
7 | 6 | nnzd 12647 | . . . 4 ⊢ (𝜑 → 𝑁 ∈ ℤ) |
8 | 0z 12631 | . . . . 5 ⊢ 0 ∈ ℤ | |
9 | elfz1 13558 | . . . . 5 ⊢ ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐾 ∈ (0...𝑁) ↔ (𝐾 ∈ ℤ ∧ 0 ≤ 𝐾 ∧ 𝐾 ≤ 𝑁))) | |
10 | 8, 9 | mpan 690 | . . . 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 257 | . 2 ⊢ (𝜑 → 𝐾 ∈ (0...𝑁)) |
13 | bccl2 14368 | . 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 206 ∧ w3a 1087 ∈ wcel 2108 class class class wbr 5151 (class class class)co 7438 0cc0 11162 ≤ cle 11303 ℕcn 12273 ℕ0cn0 12533 ℤcz 12620 ...cfz 13553 Ccbc 14347 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5305 ax-nul 5315 ax-pow 5374 ax-pr 5441 ax-un 7761 ax-cnex 11218 ax-resscn 11219 ax-1cn 11220 ax-icn 11221 ax-addcl 11222 ax-addrcl 11223 ax-mulcl 11224 ax-mulrcl 11225 ax-mulcom 11226 ax-addass 11227 ax-mulass 11228 ax-distr 11229 ax-i2m1 11230 ax-1ne0 11231 ax-1rid 11232 ax-rnegex 11233 ax-rrecex 11234 ax-cnre 11235 ax-pre-lttri 11236 ax-pre-lttrn 11237 ax-pre-ltadd 11238 ax-pre-mulgt0 11239 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3483 df-sbc 3795 df-csb 3912 df-dif 3969 df-un 3971 df-in 3973 df-ss 3983 df-pss 3986 df-nul 4343 df-if 4535 df-pw 4610 df-sn 4635 df-pr 4637 df-op 4641 df-uni 4916 df-iun 5001 df-br 5152 df-opab 5214 df-mpt 5235 df-tr 5269 df-id 5587 df-eprel 5593 df-po 5601 df-so 5602 df-fr 5645 df-we 5647 df-xp 5699 df-rel 5700 df-cnv 5701 df-co 5702 df-dm 5703 df-rn 5704 df-res 5705 df-ima 5706 df-pred 6329 df-ord 6395 df-on 6396 df-lim 6397 df-suc 6398 df-iota 6522 df-fun 6571 df-fn 6572 df-f 6573 df-f1 6574 df-fo 6575 df-f1o 6576 df-fv 6577 df-riota 7395 df-ov 7441 df-oprab 7442 df-mpo 7443 df-om 7895 df-1st 8022 df-2nd 8023 df-frecs 8314 df-wrecs 8345 df-recs 8419 df-rdg 8458 df-er 8753 df-en 8994 df-dom 8995 df-sdom 8996 df-pnf 11304 df-mnf 11305 df-xr 11306 df-ltxr 11307 df-le 11308 df-sub 11501 df-neg 11502 df-div 11928 df-nn 12274 df-n0 12534 df-z 12621 df-uz 12886 df-rp 13042 df-fz 13554 df-seq 14049 df-fac 14319 df-bc 14348 |
This theorem is referenced by: lcmineqlem11 42035 lcmineqlem15 42039 lcmineqlem16 42040 lcmineqlem19 42043 lcmineqlem20 42044 |
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