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| Mirrors > Home > MPE Home > Th. List > bccl2 | Structured version Visualization version GIF version | ||
| Description: A binomial coefficient, in its standard domain, is a positive integer. (Contributed by NM, 3-Jan-2006.) (Revised by Mario Carneiro, 10-Mar-2014.) |
| Ref | Expression |
|---|---|
| bccl2 | ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elfz3nn0 13643 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝑁 ∈ ℕ0) | |
| 2 | elfzelz 13546 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝐾 ∈ ℤ) | |
| 3 | bccl 14344 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝑁C𝐾) ∈ ℕ0) | |
| 4 | 1, 2, 3 | syl2anc 584 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ0) |
| 5 | bcrpcl 14330 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℝ+) | |
| 6 | 5 | rpgt0d 13062 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → 0 < (𝑁C𝐾)) |
| 7 | elnnnn0b 12553 | . 2 ⊢ ((𝑁C𝐾) ∈ ℕ ↔ ((𝑁C𝐾) ∈ ℕ0 ∧ 0 < (𝑁C𝐾))) | |
| 8 | 4, 6, 7 | sylanbrc 583 | 1 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2107 class class class wbr 5123 (class class class)co 7413 0cc0 11137 < clt 11277 ℕcn 12248 ℕ0cn0 12509 ℤcz 12596 ...cfz 13529 Ccbc 14324 |
| 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 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2706 ax-sep 5276 ax-nul 5286 ax-pow 5345 ax-pr 5412 ax-un 7737 ax-cnex 11193 ax-resscn 11194 ax-1cn 11195 ax-icn 11196 ax-addcl 11197 ax-addrcl 11198 ax-mulcl 11199 ax-mulrcl 11200 ax-mulcom 11201 ax-addass 11202 ax-mulass 11203 ax-distr 11204 ax-i2m1 11205 ax-1ne0 11206 ax-1rid 11207 ax-rnegex 11208 ax-rrecex 11209 ax-cnre 11210 ax-pre-lttri 11211 ax-pre-lttrn 11212 ax-pre-ltadd 11213 ax-pre-mulgt0 11214 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2808 df-nfc 2884 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4888 df-iun 4973 df-br 5124 df-opab 5186 df-mpt 5206 df-tr 5240 df-id 5558 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5617 df-we 5619 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6301 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7870 df-1st 7996 df-2nd 7997 df-frecs 8288 df-wrecs 8319 df-recs 8393 df-rdg 8432 df-er 8727 df-en 8968 df-dom 8969 df-sdom 8970 df-pnf 11279 df-mnf 11280 df-xr 11281 df-ltxr 11282 df-le 11283 df-sub 11476 df-neg 11477 df-div 11903 df-nn 12249 df-n0 12510 df-z 12597 df-uz 12861 df-rp 13017 df-fz 13530 df-seq 14025 df-fac 14296 df-bc 14325 |
| This theorem is referenced by: permnn 14348 binom11 15851 binom1dif 15852 bpolydiflem 16073 efaddlem 16112 sylow1lem1 19585 srgbinomlem3 20194 basellem2 27062 basellem3 27063 basellem5 27065 chtublem 27192 bposlem1 27265 bposlem3 27267 bposlem5 27269 bposlem6 27270 chebbnd1lem1 27450 bcm1n 32741 ballotth 34515 bccl2d 41967 lcmineqlem6 42010 bcled 42154 bcle2d 42155 mccllem 45584 |
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