negexpidd - Mathbox for Igor Ieskov

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Theorem negexpidd 42339

Description: The sum of a real number to the power of N and the negative of the number to the power of N equals zero if N is a nonnegative odd integer. (Contributed by Igor Ieskov, 21-Jan-2024.)

**Hypotheses**
Ref	Expression
negexpidd.1	⊢ (𝜑 → 𝐴 ∈ ℝ)
negexpidd.2	⊢ (𝜑 → 𝑁 ∈ ℕ₀)
negexpidd.3	⊢ (𝜑 → ¬ 2 ∥ 𝑁)

**Assertion**
Ref	Expression
negexpidd	⊢ (𝜑 → ((𝐴↑𝑁) + (-𝐴↑𝑁)) = 0)

**Proof of Theorem negexpidd**
Step	Hyp	Ref	Expression
1		negexpidd.1	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ)
2		negexpidd.2	. . . . 5 ⊢ (𝜑 → 𝑁 ∈ ℕ₀)
3	1, 2	reexpcld 14182	. . . 4 ⊢ (𝜑 → (𝐴↑𝑁) ∈ ℝ)
4	3	recnd 11292	. . 3 ⊢ (𝜑 → (𝐴↑𝑁) ∈ ℂ)
5	4	negidd 11611	. 2 ⊢ (𝜑 → ((𝐴↑𝑁) + -(𝐴↑𝑁)) = 0)
6	1	recnd 11292	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℂ)
7	6	mulm1d 11716	. . . . . . 7 ⊢ (𝜑 → (-1 · 𝐴) = -𝐴)
8	7	eqcomd 2732	. . . . . 6 ⊢ (𝜑 → -𝐴 = (-1 · 𝐴))
9	8	oveq1d 7439	. . . . 5 ⊢ (𝜑 → (-𝐴↑𝑁) = ((-1 · 𝐴)↑𝑁))
10		nn0z 12635	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℤ)
11	10	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℤ))
12		negexpidd.3	. . . . . . . . . . 11 ⊢ (𝜑 → ¬ 2 ∥ 𝑁)
13	11, 12	jctird 525	. . . . . . . . . 10 ⊢ (𝜑 → (𝑁 ∈ ℕ₀ → (𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁)))
14	2, 13	mpd 15	. . . . . . . . 9 ⊢ (𝜑 → (𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁))
15		m1expo 16377	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1)
16	15	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ((𝑁 ∈ ℤ ∧ ¬ 2 ∥ 𝑁) → (-1↑𝑁) = -1))
17	14, 16	mpd 15	. . . . . . . 8 ⊢ (𝜑 → (-1↑𝑁) = -1)
18	17	oveq1d 7439	. . . . . . 7 ⊢ (𝜑 → ((-1↑𝑁) · (𝐴↑𝑁)) = (-1 · (𝐴↑𝑁)))
19	4	mulm1d 11716	. . . . . . 7 ⊢ (𝜑 → (-1 · (𝐴↑𝑁)) = -(𝐴↑𝑁))
20	18, 19	eqtr2d 2767	. . . . . 6 ⊢ (𝜑 → -(𝐴↑𝑁) = ((-1↑𝑁) · (𝐴↑𝑁)))
21		neg1cn 12378	. . . . . . . 8 ⊢ -1 ∈ ℂ
22	21	a1i 11	. . . . . . 7 ⊢ (𝜑 → -1 ∈ ℂ)
23	22, 6, 2	mulexpd 14180	. . . . . 6 ⊢ (𝜑 → ((-1 · 𝐴)↑𝑁) = ((-1↑𝑁) · (𝐴↑𝑁)))
24	20, 23	eqtr4d 2769	. . . . 5 ⊢ (𝜑 → -(𝐴↑𝑁) = ((-1 · 𝐴)↑𝑁))
25	9, 24	eqtr4d 2769	. . . 4 ⊢ (𝜑 → (-𝐴↑𝑁) = -(𝐴↑𝑁))
26	25	oveq2d 7440	. . 3 ⊢ (𝜑 → ((𝐴↑𝑁) + (-𝐴↑𝑁)) = ((𝐴↑𝑁) + -(𝐴↑𝑁)))
27	26	eqeq1d 2728	. 2 ⊢ (𝜑 → (((𝐴↑𝑁) + (-𝐴↑𝑁)) = 0 ↔ ((𝐴↑𝑁) + -(𝐴↑𝑁)) = 0))
28	5, 27	mpbird 256	1 ⊢ (𝜑 → ((𝐴↑𝑁) + (-𝐴↑𝑁)) = 0)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 394 = wceq 1534 ∈ wcel 2099 class class class wbr 5153 (class class class)co 7424 ℂcc 11156 ℝcr 11157 0cc0 11158 1c1 11159 + caddc 11161 · cmul 11163 -cneg 11495 2c2 12319 ℕ₀cn0 12524 ℤcz 12610 ↑cexp 14081 ∥ cdvds 16256

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 2697 ax-sep 5304 ax-nul 5311 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11214 ax-resscn 11215 ax-1cn 11216 ax-icn 11217 ax-addcl 11218 ax-addrcl 11219 ax-mulcl 11220 ax-mulrcl 11221 ax-mulcom 11222 ax-addass 11223 ax-mulass 11224 ax-distr 11225 ax-i2m1 11226 ax-1ne0 11227 ax-1rid 11228 ax-rnegex 11229 ax-rrecex 11230 ax-cnre 11231 ax-pre-lttri 11232 ax-pre-lttrn 11233 ax-pre-ltadd 11234 ax-pre-mulgt0 11235

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2704 df-cleq 2718 df-clel 2803 df-nfc 2878 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3464 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3967 df-nul 4326 df-if 4534 df-pw 4609 df-sn 4634 df-pr 4636 df-op 4640 df-uni 4914 df-iun 5003 df-br 5154 df-opab 5216 df-mpt 5237 df-tr 5271 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6312 df-ord 6379 df-on 6380 df-lim 6381 df-suc 6382 df-iota 6506 df-fun 6556 df-fn 6557 df-f 6558 df-f1 6559 df-fo 6560 df-f1o 6561 df-fv 6562 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7877 df-2nd 8004 df-frecs 8296 df-wrecs 8327 df-recs 8401 df-rdg 8440 df-er 8734 df-en 8975 df-dom 8976 df-sdom 8977 df-pnf 11300 df-mnf 11301 df-xr 11302 df-ltxr 11303 df-le 11304 df-sub 11496 df-neg 11497 df-div 11922 df-nn 12265 df-2 12327 df-n0 12525 df-z 12611 df-uz 12875 df-seq 14022 df-exp 14082 df-dvds 16257

This theorem is referenced by: 3cubeslem3r 42344

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