# 8 Enthymeme

Topics: Logic, Argument, Premise Pages: 18 (984 words) Published: April 21, 2015
Enthymeme

1

Types
of
Categorical
Arguments
1.
Enthymeme
(having
less
than
3
propositions)

2.
Syllogism
(having
3
propositions)

3.
Sorites
(having
more
than
3
propositions)

2

Enthymeme
Deﬁnition
•  The
incomplete
form
of
argument
having
omitted

premise

or
conclusion.

e.g.

Diamond
is
expensive,
because
it
is
rare.

•  Enthymeme
represents
the
general
use
of
argument
in

natural
language
which
is
sometimes
concise,
unclear
or

even
ambiguous.

Sometimes
the
speaker/writer
of
an
enthymeme
may

assume
that
the
would
understand
the

unspoken
details,
and
it
can
be
the
case
that
the
speaker/
writer
wants
to
conceal
some
facts.

3

How
to
check
an
enthymeme
To
check
an
enthymeme
is
to
check
its
soundness.

A
sound
enthymeme
must
conform
with
the
criteria

of
being
valid
and
true:

Criteria
1
(validity)
the
argument
is
valid.

The
conclusion
is
derived
from
the

premises.

Criteria
2
(truth)
each
proposition
is
true.

Each
proposition
is
the
fact.

4

Steps
for
checking
an
enthymeme
1.
Form
an
enthymeme
as
syllogism

-­‐
Transform
the
provided
propositions.

“Diamond
is
expensive,
because
it
is
rare.”

-­‐
Set
the
syllogism.

Example

Major
Premise:

?
(omitted)

Minor
Premise:

All
diamonds
are
rare
objects.

Conclusion:

All
diamonds
are
expensive
objects.

5

2.
Identify
the
omitted
proposition.

Try
make
the
argument
to
be
valid
i.e.

conforming
to
the
six
rules.

Major
Premise:

All
rare
objects
are
expensive
objects.

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