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The case for teaching
syllogistic logic to philosophy
students
Brendan Larvor
University of Hertfordshire
E.g. All manxome things whiffle.
The Jabberwock is manxome.
๏œ The Jabberwock whiffles.
E.g. All Ms are Ws
The J is an M
๏œ The J is a W
E.g. All Xs are Ys
The Z is an X
๏œ The Z is a Y
There is no possibility of
demonstrating the existence
of god.
From a set of tautologies
nothing but a further
tautology can be validly
deduced.
We cannot deduce the
existence of god from an โ€˜a
prioriโ€™ proposition.
Only โ€˜a prioriโ€™
propositions are
logically certain.
If the conclusion that a god
exists is to be demonstrably
certain, then the premises [from
which it follows] must be certain.โ€˜A prioriโ€™ propositions are
tautologies.
The existence of god is
not a tautology.
No empirical proposition
can ever be more than
probable.
All propositions are
either empirical or โ€˜a
prioriโ€™.
Two tests for validity
All Sheep are Pedants
Historical Character of
Philosophical Training
Benefits of Comparison
E.g. Existential Import
๏€จ ๏€ฉPxSxx ๏‚ฎ๏€ข
All trespassers will
be shot
All S are P
All towels will be
returned
Live Questions
All S are P
Some S are not PSome S are P
No S are P
(All S are P) or (No S are P)
(Some S are P) and (Some S are not P)
Contradictories
Contraries
Sub-Contraries
Entailment

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The case for teaching syllogistic logic to philosophy

  • 1. The case for teaching syllogistic logic to philosophy students Brendan Larvor University of Hertfordshire
  • 2. E.g. All manxome things whiffle. The Jabberwock is manxome. ๏œ The Jabberwock whiffles. E.g. All Ms are Ws The J is an M ๏œ The J is a W E.g. All Xs are Ys The Z is an X ๏œ The Z is a Y
  • 3. There is no possibility of demonstrating the existence of god. From a set of tautologies nothing but a further tautology can be validly deduced. We cannot deduce the existence of god from an โ€˜a prioriโ€™ proposition. Only โ€˜a prioriโ€™ propositions are logically certain. If the conclusion that a god exists is to be demonstrably certain, then the premises [from which it follows] must be certain.โ€˜A prioriโ€™ propositions are tautologies. The existence of god is not a tautology. No empirical proposition can ever be more than probable. All propositions are either empirical or โ€˜a prioriโ€™.
  • 4. Two tests for validity All Sheep are Pedants
  • 6. Benefits of Comparison E.g. Existential Import ๏€จ ๏€ฉPxSxx ๏‚ฎ๏€ข All trespassers will be shot All S are P All towels will be returned
  • 7. Live Questions All S are P Some S are not PSome S are P No S are P (All S are P) or (No S are P) (Some S are P) and (Some S are not P) Contradictories Contraries Sub-Contraries Entailment