Theorem coshcl

Description: The closure of the cosh function with complex argument. (Contributed by Jon Pennant, 9-Sep-2026)

	Ref	Expression
Assertion	coshcl	$$⊢A\in ℂ\to \cosh \left(A\right)\in ℂ$$

Proof

Step	Hyp	Ref	Expression
1		coshf	$$⊢\cosh :ℂ⟶ℂ$$
2	1	ffvelcdmi	$$⊢A\in ℂ\to \cosh \left(A\right)\in ℂ$$