Description: Multiplication is an
operation on the complex numbers. This deprecated
axiom is provided for historical compatibility but is not a bona fide
axiom for complex numbers (independent of set theory) since it cannot be
interpreted as a first- or second-order statement (see
http://us.metamath.org/downloads/schmidt-cnaxioms.pdf).
. It may be
deleted in the future and should be avoided for new theorems. Instead,
the less specific ax-mulcl9103 should be used. Note that uses of ax-mulf9121
can be eliminated by using the defined operation
in place of , from which
this axiom (with the defined operation in place of ) follows as a
theorem.

This axiom is justified by theorem axmulf9072.
(New usage is discouraged.) (Contributed by NM,
19-Oct-2004.)