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Mirrors > Home > ILE Home > Th. List > eftabs | GIF version |
Description: The absolute value of a term in the series expansion of the exponential function. (Contributed by Paul Chapman, 23-Nov-2007.) |
Ref | Expression |
---|---|
eftabs | ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (abs‘((𝐴↑𝐾) / (!‘𝐾))) = (((abs‘𝐴)↑𝐾) / (!‘𝐾))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | expcl 10556 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (𝐴↑𝐾) ∈ ℂ) | |
2 | faccl 10733 | . . . . 5 ⊢ (𝐾 ∈ ℕ0 → (!‘𝐾) ∈ ℕ) | |
3 | 2 | adantl 277 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (!‘𝐾) ∈ ℕ) |
4 | 3 | nncnd 8951 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (!‘𝐾) ∈ ℂ) |
5 | 3 | nnap0d 8983 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (!‘𝐾) # 0) |
6 | 1, 4, 5 | absdivapd 11222 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (abs‘((𝐴↑𝐾) / (!‘𝐾))) = ((abs‘(𝐴↑𝐾)) / (abs‘(!‘𝐾)))) |
7 | absexp 11106 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (abs‘(𝐴↑𝐾)) = ((abs‘𝐴)↑𝐾)) | |
8 | 3 | nnred 8950 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (!‘𝐾) ∈ ℝ) |
9 | 3 | nnnn0d 9247 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (!‘𝐾) ∈ ℕ0) |
10 | 9 | nn0ge0d 9250 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → 0 ≤ (!‘𝐾)) |
11 | 8, 10 | absidd 11194 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (abs‘(!‘𝐾)) = (!‘𝐾)) |
12 | 7, 11 | oveq12d 5909 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → ((abs‘(𝐴↑𝐾)) / (abs‘(!‘𝐾))) = (((abs‘𝐴)↑𝐾) / (!‘𝐾))) |
13 | 6, 12 | eqtrd 2222 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐾 ∈ ℕ0) → (abs‘((𝐴↑𝐾) / (!‘𝐾))) = (((abs‘𝐴)↑𝐾) / (!‘𝐾))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 104 = wceq 1364 ∈ wcel 2160 ‘cfv 5231 (class class class)co 5891 ℂcc 7827 / cdiv 8647 ℕcn 8937 ℕ0cn0 9194 ↑cexp 10537 !cfa 10723 abscabs 11024 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-coll 4133 ax-sep 4136 ax-nul 4144 ax-pow 4189 ax-pr 4224 ax-un 4448 ax-setind 4551 ax-iinf 4602 ax-cnex 7920 ax-resscn 7921 ax-1cn 7922 ax-1re 7923 ax-icn 7924 ax-addcl 7925 ax-addrcl 7926 ax-mulcl 7927 ax-mulrcl 7928 ax-addcom 7929 ax-mulcom 7930 ax-addass 7931 ax-mulass 7932 ax-distr 7933 ax-i2m1 7934 ax-0lt1 7935 ax-1rid 7936 ax-0id 7937 ax-rnegex 7938 ax-precex 7939 ax-cnre 7940 ax-pre-ltirr 7941 ax-pre-ltwlin 7942 ax-pre-lttrn 7943 ax-pre-apti 7944 ax-pre-ltadd 7945 ax-pre-mulgt0 7946 ax-pre-mulext 7947 ax-arch 7948 ax-caucvg 7949 |
This theorem depends on definitions: df-bi 117 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-nul 3438 df-if 3550 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-int 3860 df-iun 3903 df-br 4019 df-opab 4080 df-mpt 4081 df-tr 4117 df-id 4308 df-po 4311 df-iso 4312 df-iord 4381 df-on 4383 df-ilim 4384 df-suc 4386 df-iom 4605 df-xp 4647 df-rel 4648 df-cnv 4649 df-co 4650 df-dm 4651 df-rn 4652 df-res 4653 df-ima 4654 df-iota 5193 df-fun 5233 df-fn 5234 df-f 5235 df-f1 5236 df-fo 5237 df-f1o 5238 df-fv 5239 df-riota 5847 df-ov 5894 df-oprab 5895 df-mpo 5896 df-1st 6159 df-2nd 6160 df-recs 6324 df-frec 6410 df-pnf 8012 df-mnf 8013 df-xr 8014 df-ltxr 8015 df-le 8016 df-sub 8148 df-neg 8149 df-reap 8550 df-ap 8557 df-div 8648 df-inn 8938 df-2 8996 df-3 8997 df-4 8998 df-n0 9195 df-z 9272 df-uz 9547 df-rp 9672 df-seqfrec 10464 df-exp 10538 df-fac 10724 df-cj 10869 df-re 10870 df-im 10871 df-rsqrt 11025 df-abs 11026 |
This theorem is referenced by: efcllemp 11684 eftlub 11716 |
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