Theorem expm1d

Description: Value of a complex number raised to an integer power minus one. (Contributed by Mario Carneiro, 28-May-2016)

	Ref	Expression
Hypotheses	expcld.1	$$⊢\phi \to A\in ℂ$$
	sqrecd.1	$$⊢\phi \to A\ne 0$$
	expclzd.3	$$⊢\phi \to N\in \mathbb{Z}$$
Assertion	expm1d	$$⊢\phi \to A^{N-1}=\frac{A^N}{A}$$

Proof

Step	Hyp	Ref	Expression
1		expcld.1	$$⊢\phi \to A\in ℂ$$
2		sqrecd.1	$$⊢\phi \to A\ne 0$$
3		expclzd.3	$$⊢\phi \to N\in \mathbb{Z}$$
4		expm1	$$⊢\left(A\in ℂ\wedge A\ne 0\wedge N\in \mathbb{Z}\right)\to A^{N-1}=\frac{A^N}{A}$$
5	1 2 3 4	syl3anc	$$⊢\phi \to A^{N-1}=\frac{A^N}{A}$$