| Description: Multiplication is an
operation on the complex numbers. This axiom tells
us that · is defined only on complex
numbers which is analogous to
the way that other operations are defined, for example see subf 8281
or
eff 12018. However, while Metamath can handle this
axiom, if we wish to work
with weaker complex number axioms, we can avoid it by using the less
specific mulcl 8059. Note that uses of ax-mulf 8055 can be eliminated by using
the defined operation (𝑥 ∈ ℂ, 𝑦 ∈ ℂ ↦ (𝑥 · 𝑦)) in place of
·, as seen in mpomulf 8069.
This axiom is justified by Theorem axmulf 7989. (New usage is discouraged.)
(Contributed by NM, 19-Oct-2004.) |
