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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 13623 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝑁 ∈ ℕ0) | |
| 2 | elfzelz 13526 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → 𝐾 ∈ ℤ) | |
| 3 | bccl 14332 | . . 3 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐾 ∈ ℤ) → (𝑁C𝐾) ∈ ℕ0) | |
| 4 | 1, 2, 3 | syl2anc 593 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ0) |
| 5 | bcrpcl 14318 | . . 3 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℝ+) | |
| 6 | 5 | rpgt0d 13037 | . 2 ⊢ (𝐾 ∈ (0...𝑁) → 0 < (𝑁C𝐾)) |
| 7 | elnnnn0b 12522 | . 2 ⊢ ((𝑁C𝐾) ∈ ℕ ↔ ((𝑁C𝐾) ∈ ℕ0 ∧ 0 < (𝑁C𝐾))) | |
| 8 | 4, 6, 7 | sylanbrc 592 | 1 ⊢ (𝐾 ∈ (0...𝑁) → (𝑁C𝐾) ∈ ℕ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2141 class class class wbr 5099 (class class class)co 7392 0cc0 11070 < clt 11213 ℕcn 12207 ℕ0cn0 12478 ℤcz 12565 ...cfz 13509 Ccbc 14312 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-om 7843 df-1st 7966 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-div 11842 df-nn 12208 df-n0 12479 df-z 12566 df-uz 12837 df-rp 12991 df-fz 13510 df-seq 14012 df-fac 14284 df-bc 14313 |
| This theorem is referenced by: permnn 14336 binom11 15845 binom1dif 15846 bpolydiflem 16067 efaddlem 16106 sylow1lem1 19621 srgbinomlem3 20257 basellem2 27123 basellem3 27124 basellem5 27126 chtublem 27252 bposlem1 27325 bposlem3 27327 bposlem5 27329 bposlem6 27330 chebbnd1lem1 27510 bcm1n 32947 ballotth 34796 bccl2d 42572 lcmineqlem6 42615 bcled 42759 bcle2d 42760 mccllem 46137 |
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