| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 13582 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝑁 ∈ ℕ0) | |
| 2 | elfzelz 13485 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝐾 ∈ ℤ) | |
| 3 | bccl 14287 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝑁C𝐾) ∈ ℕ0) | |
| 4 | 1, 2, 3 | syl2anc 584 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ0) |
| 5 | bcrpcl 14273 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℝ+) | |
| 6 | 5 | rpgt0d 12998 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → 0 < (𝑁C𝐾)) |
| 7 | elnnnn0b 12486 | . 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 2109 class class class wbr 5107 (class class class)co 7387 0cc0 11068 < clt 11208 ℕcn 12186 ℕ0cn0 12442 ℤcz 12529 ...cfz 13468 Ccbc 14267 |
| 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-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-cnex 11124 ax-resscn 11125 ax-1cn 11126 ax-icn 11127 ax-addcl 11128 ax-addrcl 11129 ax-mulcl 11130 ax-mulrcl 11131 ax-mulcom 11132 ax-addass 11133 ax-mulass 11134 ax-distr 11135 ax-i2m1 11136 ax-1ne0 11137 ax-1rid 11138 ax-rnegex 11139 ax-rrecex 11140 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143 ax-pre-ltadd 11144 ax-pre-mulgt0 11145 |
| 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 3354 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-iun 4957 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-pred 6274 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-riota 7344 df-ov 7390 df-oprab 7391 df-mpo 7392 df-om 7843 df-1st 7968 df-2nd 7969 df-frecs 8260 df-wrecs 8291 df-recs 8340 df-rdg 8378 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-sub 11407 df-neg 11408 df-div 11836 df-nn 12187 df-n0 12443 df-z 12530 df-uz 12794 df-rp 12952 df-fz 13469 df-seq 13967 df-fac 14239 df-bc 14268 |
| This theorem is referenced by: permnn 14291 binom11 15798 binom1dif 15799 bpolydiflem 16020 efaddlem 16059 sylow1lem1 19528 srgbinomlem3 20137 basellem2 26992 basellem3 26993 basellem5 26995 chtublem 27122 bposlem1 27195 bposlem3 27197 bposlem5 27199 bposlem6 27200 chebbnd1lem1 27380 bcm1n 32718 ballotth 34529 bccl2d 41979 lcmineqlem6 42022 bcled 42166 bcle2d 42167 mccllem 45595 |
| Copyright terms: Public domain | W3C validator |