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Mirrors > Home > MPE Home > Th. List > expsub | Structured version Visualization version GIF version |
Description: Exponent subtraction law for nonnegative integer exponentiation. (Contributed by NM, 2-Aug-2006.) (Revised by Mario Carneiro, 4-Jun-2014.) |
Ref | Expression |
---|---|
expsub | ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑(𝑀 − 𝑁)) = ((𝐴↑𝑀) / (𝐴↑𝑁))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | znegcl 12046 | . . 3 ⊢ (𝑁 ∈ ℤ → -𝑁 ∈ ℤ) | |
2 | expaddz 13513 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ -𝑁 ∈ ℤ)) → (𝐴↑(𝑀 + -𝑁)) = ((𝐴↑𝑀) · (𝐴↑-𝑁))) | |
3 | 1, 2 | sylanr2 683 | . 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑(𝑀 + -𝑁)) = ((𝐴↑𝑀) · (𝐴↑-𝑁))) |
4 | zcn 12015 | . . . . 5 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℂ) | |
5 | zcn 12015 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
6 | negsub 10962 | . . . . 5 ⊢ ((𝑀 ∈ ℂ ∧ 𝑁 ∈ ℂ) → (𝑀 + -𝑁) = (𝑀 − 𝑁)) | |
7 | 4, 5, 6 | syl2an 599 | . . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 + -𝑁) = (𝑀 − 𝑁)) |
8 | 7 | adantl 486 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀 + -𝑁) = (𝑀 − 𝑁)) |
9 | 8 | oveq2d 7164 | . 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑(𝑀 + -𝑁)) = (𝐴↑(𝑀 − 𝑁))) |
10 | expnegz 13503 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ∧ 𝑁 ∈ ℤ) → (𝐴↑-𝑁) = (1 / (𝐴↑𝑁))) | |
11 | 10 | 3expa 1116 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ 𝑁 ∈ ℤ) → (𝐴↑-𝑁) = (1 / (𝐴↑𝑁))) |
12 | 11 | adantrl 716 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑-𝑁) = (1 / (𝐴↑𝑁))) |
13 | 12 | oveq2d 7164 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝐴↑𝑀) · (𝐴↑-𝑁)) = ((𝐴↑𝑀) · (1 / (𝐴↑𝑁)))) |
14 | expclz 13494 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ∧ 𝑀 ∈ ℤ) → (𝐴↑𝑀) ∈ ℂ) | |
15 | 14 | 3expa 1116 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ 𝑀 ∈ ℤ) → (𝐴↑𝑀) ∈ ℂ) |
16 | 15 | adantrr 717 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑𝑀) ∈ ℂ) |
17 | expclz 13494 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ∧ 𝑁 ∈ ℤ) → (𝐴↑𝑁) ∈ ℂ) | |
18 | 17 | 3expa 1116 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ 𝑁 ∈ ℤ) → (𝐴↑𝑁) ∈ ℂ) |
19 | 18 | adantrl 716 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑𝑁) ∈ ℂ) |
20 | expne0i 13501 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ∧ 𝑁 ∈ ℤ) → (𝐴↑𝑁) ≠ 0) | |
21 | 20 | 3expa 1116 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ 𝑁 ∈ ℤ) → (𝐴↑𝑁) ≠ 0) |
22 | 21 | adantrl 716 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑𝑁) ≠ 0) |
23 | 16, 19, 22 | divrecd 11447 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝐴↑𝑀) / (𝐴↑𝑁)) = ((𝐴↑𝑀) · (1 / (𝐴↑𝑁)))) |
24 | 13, 23 | eqtr4d 2797 | . 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝐴↑𝑀) · (𝐴↑-𝑁)) = ((𝐴↑𝑀) / (𝐴↑𝑁))) |
25 | 3, 9, 24 | 3eqtr3d 2802 | 1 ⊢ (((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝐴↑(𝑀 − 𝑁)) = ((𝐴↑𝑀) / (𝐴↑𝑁))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 400 = wceq 1539 ∈ wcel 2112 ≠ wne 2952 (class class class)co 7148 ℂcc 10563 0cc0 10565 1c1 10566 + caddc 10568 · cmul 10570 − cmin 10898 -cneg 10899 / cdiv 11325 ℤcz 12010 ↑cexp 13469 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-sep 5167 ax-nul 5174 ax-pow 5232 ax-pr 5296 ax-un 7457 ax-cnex 10621 ax-resscn 10622 ax-1cn 10623 ax-icn 10624 ax-addcl 10625 ax-addrcl 10626 ax-mulcl 10627 ax-mulrcl 10628 ax-mulcom 10629 ax-addass 10630 ax-mulass 10631 ax-distr 10632 ax-i2m1 10633 ax-1ne0 10634 ax-1rid 10635 ax-rnegex 10636 ax-rrecex 10637 ax-cnre 10638 ax-pre-lttri 10639 ax-pre-lttrn 10640 ax-pre-ltadd 10641 ax-pre-mulgt0 10642 |
This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2902 df-ne 2953 df-nel 3057 df-ral 3076 df-rex 3077 df-reu 3078 df-rmo 3079 df-rab 3080 df-v 3412 df-sbc 3698 df-csb 3807 df-dif 3862 df-un 3864 df-in 3866 df-ss 3876 df-pss 3878 df-nul 4227 df-if 4419 df-pw 4494 df-sn 4521 df-pr 4523 df-tp 4525 df-op 4527 df-uni 4797 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5428 df-eprel 5433 df-po 5441 df-so 5442 df-fr 5481 df-we 5483 df-xp 5528 df-rel 5529 df-cnv 5530 df-co 5531 df-dm 5532 df-rn 5533 df-res 5534 df-ima 5535 df-pred 6124 df-ord 6170 df-on 6171 df-lim 6172 df-suc 6173 df-iota 6292 df-fun 6335 df-fn 6336 df-f 6337 df-f1 6338 df-fo 6339 df-f1o 6340 df-fv 6341 df-riota 7106 df-ov 7151 df-oprab 7152 df-mpo 7153 df-om 7578 df-2nd 7692 df-wrecs 7955 df-recs 8016 df-rdg 8054 df-er 8297 df-en 8526 df-dom 8527 df-sdom 8528 df-pnf 10705 df-mnf 10706 df-xr 10707 df-ltxr 10708 df-le 10709 df-sub 10900 df-neg 10901 df-div 11326 df-nn 11665 df-n0 11925 df-z 12011 df-uz 12273 df-seq 13409 df-exp 13470 |
This theorem is referenced by: expm1 13519 expsubd 13561 ltexp2a 13570 leexp2a 13576 iexpcyc 13609 expmulnbnd 13636 dvdsprmpweqle 16267 m1expaddsub 18683 psgnuni 18684 aaliou3lem8 25030 hgt750lem 32140 fmtnoprmfac2lem1 44441 digexp 45376 dignn0flhalflem1 45384 |
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