Last Updated：2025/12/29
Sentence
In
addition
to
concepts
and
conceptual
senses,
Frege
holds
that
there
are
extensions
of
concepts.
Frege
calls
an
extension
of
a
concept
a
‘course
of
values’.
A
course
of
values
is
determined
by
the
value
that
the
concept
has
for
each
of
its
arguments.
Thus,
the
course
of
values
for
the
concept
__
is
a
dog
records
that
its
value
for
the
argument
Zermela
is
the
True
and
for
Socrates
is
the
False,
and
so
on.
If
two
concepts
have
the
same
values
for
every
argument,
then
their
courses
of
values
are
the
same.
Thus,
courses
of
values
are
extensional.
Quizzes for review
In addition to concepts and conceptual senses, Frege holds that there are extensions of concepts. Frege calls an extension of a concept a ‘course of values’. A course of values is determined by the value that the concept has for each of its arguments. Thus, the course of values for the concept __ is a dog records that its value for the argument Zermela is the True and for Socrates is the False, and so on. If two concepts have the same values for every argument, then their courses of values are the same. Thus, courses of values are extensional.
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