gamp1 - Metamath Proof Explorer

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Theorem gamp1 26796

Description: The functional equation of the Gamma function. (Contributed by Mario Carneiro, 9-Jul-2017.)

**Assertion**
Ref	Expression
gamp1	⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (Γ‘(𝐴 + 1)) = ((Γ‘𝐴) · 𝐴))

**Proof of Theorem gamp1**
Step	Hyp	Ref	Expression
1		lgamp1 26795	. . . 4 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (log Γ‘(𝐴 + 1)) = ((log Γ‘𝐴) + (log‘𝐴)))
2	1	fveq2d 6896	. . 3 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log Γ‘(𝐴 + 1))) = (exp‘((log Γ‘𝐴) + (log‘𝐴))))
3		lgamcl 26779	. . . 4 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (log Γ‘𝐴) ∈ ℂ)
4		eldifi 4127	. . . . 5 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → 𝐴 ∈ ℂ)
5		id 22	. . . . . 6 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → 𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)))
6	5	dmgmn0 26764	. . . . 5 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → 𝐴 ≠ 0)
7	4, 6	logcld 26313	. . . 4 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (log‘𝐴) ∈ ℂ)
8		efadd 16043	. . . 4 ⊢ (((log Γ‘𝐴) ∈ ℂ ∧ (log‘𝐴) ∈ ℂ) → (exp‘((log Γ‘𝐴) + (log‘𝐴))) = ((exp‘(log Γ‘𝐴)) · (exp‘(log‘𝐴))))
9	3, 7, 8	syl2anc 582	. . 3 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘((log Γ‘𝐴) + (log‘𝐴))) = ((exp‘(log Γ‘𝐴)) · (exp‘(log‘𝐴))))
10		eflog 26319	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (exp‘(log‘𝐴)) = 𝐴)
11	4, 6, 10	syl2anc 582	. . . 4 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log‘𝐴)) = 𝐴)
12	11	oveq2d 7429	. . 3 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → ((exp‘(log Γ‘𝐴)) · (exp‘(log‘𝐴))) = ((exp‘(log Γ‘𝐴)) · 𝐴))
13	2, 9, 12	3eqtrd 2774	. 2 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log Γ‘(𝐴 + 1))) = ((exp‘(log Γ‘𝐴)) · 𝐴))
14		1nn0 12494	. . . . 5 ⊢ 1 ∈ ℕ₀
15	14	a1i 11	. . . 4 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → 1 ∈ ℕ₀)
16	5, 15	dmgmaddnn0 26765	. . 3 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (𝐴 + 1) ∈ (ℂ ∖ (ℤ ∖ ℕ)))
17		eflgam 26783	. . 3 ⊢ ((𝐴 + 1) ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log Γ‘(𝐴 + 1))) = (Γ‘(𝐴 + 1)))
18	16, 17	syl 17	. 2 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log Γ‘(𝐴 + 1))) = (Γ‘(𝐴 + 1)))
19		eflgam 26783	. . 3 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (exp‘(log Γ‘𝐴)) = (Γ‘𝐴))
20	19	oveq1d 7428	. 2 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → ((exp‘(log Γ‘𝐴)) · 𝐴) = ((Γ‘𝐴) · 𝐴))
21	13, 18, 20	3eqtr3d 2778	1 ⊢ (𝐴 ∈ (ℂ ∖ (ℤ ∖ ℕ)) → (Γ‘(𝐴 + 1)) = ((Γ‘𝐴) · 𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 ∖ cdif 3946 ‘cfv 6544 (class class class)co 7413 ℂcc 11112 0cc0 11114 1c1 11115 + caddc 11117 · cmul 11119 ℕcn 12218 ℕ₀cn0 12478 ℤcz 12564 expce 16011 logclog 26297 log Γclgam 26754 Γcgam 26755

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7729 ax-inf2 9640 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191 ax-pre-sup 11192 ax-addf 11193 ax-mulf 11194

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-se 5633 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-isom 6553 df-riota 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-of 7674 df-om 7860 df-1st 7979 df-2nd 7980 df-supp 8151 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-2o 8471 df-oadd 8474 df-er 8707 df-map 8826 df-pm 8827 df-ixp 8896 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-fsupp 9366 df-fi 9410 df-sup 9441 df-inf 9442 df-oi 9509 df-dju 9900 df-card 9938 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11452 df-neg 11453 df-div 11878 df-nn 12219 df-2 12281 df-3 12282 df-4 12283 df-5 12284 df-6 12285 df-7 12286 df-8 12287 df-9 12288 df-n0 12479 df-z 12565 df-dec 12684 df-uz 12829 df-q 12939 df-rp 12981 df-xneg 13098 df-xadd 13099 df-xmul 13100 df-ioo 13334 df-ioc 13335 df-ico 13336 df-icc 13337 df-fz 13491 df-fzo 13634 df-fl 13763 df-mod 13841 df-seq 13973 df-exp 14034 df-fac 14240 df-bc 14269 df-hash 14297 df-shft 15020 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-limsup 15421 df-clim 15438 df-rlim 15439 df-sum 15639 df-ef 16017 df-sin 16019 df-cos 16020 df-tan 16021 df-pi 16022 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17151 df-ress 17180 df-plusg 17216 df-mulr 17217 df-starv 17218 df-sca 17219 df-vsca 17220 df-ip 17221 df-tset 17222 df-ple 17223 df-ds 17225 df-unif 17226 df-hom 17227 df-cco 17228 df-rest 17374 df-topn 17375 df-0g 17393 df-gsum 17394 df-topgen 17395 df-pt 17396 df-prds 17399 df-xrs 17454 df-qtop 17459 df-imas 17460 df-xps 17462 df-mre 17536 df-mrc 17537 df-acs 17539 df-mgm 18567 df-sgrp 18646 df-mnd 18662 df-submnd 18708 df-mulg 18989 df-cntz 19224 df-cmn 19693 df-psmet 21138 df-xmet 21139 df-met 21140 df-bl 21141 df-mopn 21142 df-fbas 21143 df-fg 21144 df-cnfld 21147 df-top 22618 df-topon 22635 df-topsp 22657 df-bases 22671 df-cld 22745 df-ntr 22746 df-cls 22747 df-nei 22824 df-lp 22862 df-perf 22863 df-cn 22953 df-cnp 22954 df-haus 23041 df-cmp 23113 df-tx 23288 df-hmeo 23481 df-fil 23572 df-fm 23664 df-flim 23665 df-flf 23666 df-xms 24048 df-ms 24049 df-tms 24050 df-cncf 24620 df-limc 25617 df-dv 25618 df-ulm 26123 df-log 26299 df-cxp 26300 df-lgam 26757 df-gam 26758

This theorem is referenced by: facgam 26804

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