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Related theorems GIF version |
| Description: Closure law for multiplication of complex numbers. Axiom 7 of 25 for real and complex numbers, derived from ZF set theory. |
| Ref | Expression |
|---|---|
| axmulcl | ⊢ ((A ∈ ℂ ⋀ B ∈ ℂ) → (A · B) ∈ ℂ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axmulopr 5249 | . 2 ⊢ · :(ℂ × ℂ)–→ℂ | |
| 2 | 1 | foprcl 4010 | 1 ⊢ ((A ∈ ℂ ⋀ B ∈ ℂ) → (A · B) ∈ ℂ) |