• What conditions are in effect?  a fortiori
  • What comes first?  a priori – in time or causation.
  • What happened immediately before and after X? causation – a posteriori
    • did _ cause _? modus ponens/modus tollens
    • If _ is true, what cannot be true? contradiction (square of opposition)
    • Are _ and _ mutually exclusive, or can they coexist?  contrariety (square of opposition)
  • Ramification
    • What were/would be the effects if the choice is affirmative?
    • What were/would be the effects if the choice is negative
  • Final Cause
  • Efficient Cause
  • Sufficient and Necessary Cause

The laws of reason bound the possibilities of inference.

The activities of human reason:

  1. Simple Apprehension – Term
    1. sense perception – perception
    2. image – imagination
    3. abstraction – intuition
  2. Judgement – Proposition
    1. a connection of abstractions
    2. logical relationship of ideas
    3. truth or falsehood
  3. Inference – Conclusion
    1. deductive – universal
    2. inductive – particular

Formal Logic provides validity of an argument (terms, propositions and conclusions) as to their proper connection.

Propositional Logic and symbolic logic are abstractions of the relation of propositions through logical operators.

Material Logic examines the content of terms.

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