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Mirrors > Home > MPE Home > Th. List > bcctr | Structured version Visualization version GIF version |
Description: Value of the central binomial coefficient. (Contributed by Mario Carneiro, 13-Mar-2014.) |
Ref | Expression |
---|---|
bcctr | โข (๐ โ โ0 โ ((2 ยท ๐)C๐) = ((!โ(2 ยท ๐)) / ((!โ๐) ยท (!โ๐)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fzctr 13646 | . . 3 โข (๐ โ โ0 โ ๐ โ (0...(2 ยท ๐))) | |
2 | bcval2 14297 | . . 3 โข (๐ โ (0...(2 ยท ๐)) โ ((2 ยท ๐)C๐) = ((!โ(2 ยท ๐)) / ((!โ((2 ยท ๐) โ ๐)) ยท (!โ๐)))) | |
3 | 1, 2 | syl 17 | . 2 โข (๐ โ โ0 โ ((2 ยท ๐)C๐) = ((!โ(2 ยท ๐)) / ((!โ((2 ยท ๐) โ ๐)) ยท (!โ๐)))) |
4 | nn0cn 12513 | . . . . . 6 โข (๐ โ โ0 โ ๐ โ โ) | |
5 | 4 | 2timesd 12486 | . . . . . 6 โข (๐ โ โ0 โ (2 ยท ๐) = (๐ + ๐)) |
6 | 4, 4, 5 | mvrladdd 11658 | . . . . 5 โข (๐ โ โ0 โ ((2 ยท ๐) โ ๐) = ๐) |
7 | 6 | fveq2d 6901 | . . . 4 โข (๐ โ โ0 โ (!โ((2 ยท ๐) โ ๐)) = (!โ๐)) |
8 | 7 | oveq1d 7435 | . . 3 โข (๐ โ โ0 โ ((!โ((2 ยท ๐) โ ๐)) ยท (!โ๐)) = ((!โ๐) ยท (!โ๐))) |
9 | 8 | oveq2d 7436 | . 2 โข (๐ โ โ0 โ ((!โ(2 ยท ๐)) / ((!โ((2 ยท ๐) โ ๐)) ยท (!โ๐))) = ((!โ(2 ยท ๐)) / ((!โ๐) ยท (!โ๐)))) |
10 | 3, 9 | eqtrd 2768 | 1 โข (๐ โ โ0 โ ((2 ยท ๐)C๐) = ((!โ(2 ยท ๐)) / ((!โ๐) ยท (!โ๐)))) |
Colors of variables: wff setvar class |
Syntax hints: โ wi 4 = wceq 1534 โ wcel 2099 โcfv 6548 (class class class)co 7420 0cc0 11139 ยท cmul 11144 โ cmin 11475 / cdiv 11902 2c2 12298 โ0cn0 12503 ...cfz 13517 !cfa 14265 Ccbc 14294 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-1st 7993 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-nn 12244 df-2 12306 df-n0 12504 df-z 12590 df-uz 12854 df-fz 13518 df-bc 14295 |
This theorem is referenced by: bposlem3 27232 |
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