最終更新日：2022/12/22
例文
Consider
the
argument:
/
15)
I
am
hungry;
therefore
I
am
hungry.
/
Intuitively
this
should
count
as
valid.
But
suppose
we
thought
of
the
components
of
arguments
as
sentences,
and
suppose
we
imagine
the
context
shifting
between
the
utterance
of
the
premise
and
the
utterance
of
the
conclusion.
Suppose
you
are
hungry
and
utter
the
premise,
and
I
am
not
hungry
and
utter
the
conclusion.
Then
we
would
have
a
true
premise
and
a
false
conclusion,
so
the
argument
would
not
be
valid.
Clearly
we
need
to
avoid
such
problems,
and
introducing
the
notion
of
a
proposition,
in
the
style
of
this
section,
is
one
way
of
doing
so.
復習用の問題
Consider the argument: / 15) I am hungry; therefore I am hungry. / Intuitively this should count as valid. But suppose we thought of the components of arguments as sentences, and suppose we imagine the context shifting between the utterance of the premise and the utterance of the conclusion. Suppose you are hungry and utter the premise, and I am not hungry and utter the conclusion. Then we would have a true premise and a false conclusion, so the argument would not be valid. Clearly we need to avoid such problems, and introducing the notion of a proposition, in the style of this section, is one way of doing so.
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