Outline
1. Logic
a.
Its position
i.
In the greater picture of peripatetic
school
ii.
as an instrumental science
iii.
Regulative, not
constitutive
Sources of Avicenna's Logic
b.
General structure of
Avicennian Logic:
i.
Definition
1.
Categories
a.
Essence
i.
Genus
ii.
Differentia
b.
Accidents
ii.
Demonstration
1.
Form
a.
Modus Ponens & Modus
tollens (Hypothetical syllogism)
b.
Deductive syllogism
c.
Induction
d.
Induction
2.
Content
iii.
The five modes of argument
1.
syllogism
2.
rhetoric
3.
polemic
4.
poetic
5.
fallacies
c.
Avicenna’s original
contributions to Aristotelian Logic:
i.
Propositional Logic: introduction
and formulation of Deductive/hypothetical syllogism
ii.
Modalities:
1.
Introduction of Time and
temporality as the fifth modality (Aristotelian four being necessity,
possibility, probability and impossibility)
2.
Introduction of necessity
by existence (as long as fire exists, it is hot; but even a mental triangle has
three angles – it’s not necessary by existence, but by essence)
1.
Introduction of conditional
or temporal necessity (any writer holds pen by necessity as long as he actually
is writing)
2.
Completion of the division
between first and secondary intelligible (Farabi had roughly introduced it)
Sources of Avicenna's Logic
1.
Introduction of conditional
or temporal necessity (any writer holds pen by necessity as long as he actually
is writing)
2.
Completion of the division
between first and secondary intelligible (Farabi had roughly introduced it)