Three Modes of Inference

Induction & Deduction. su18

Induction:
– Specific –> General: A…B… –> Rule of  A and then B
– Fact –> Rule
– General: conjecture, guess, estimation, generalization, rule

Deduction:
– General –> Specific: Rule of  A and then B + A –> B
– Rule –> Fact

Abduction (“retroduction”):
– General –> Specific: Rule of  A and then B + B –> A
– Rule –> Fact

TOTAL SEQUENCE: (Induction = 1) (Abduction = 2) (Deduction = 3, 4, 5)
1. Observe (a pattern) –>
2. Make guesses about how things generally work –>
3. Observe (later / similar thing) –>
4. New observation + Guesses –>
5. Assumed (unobserved / deduced) value

Aristotle vs. Sherlock?
Sherlock vs. House?
Formal Logic (deduction) vs. Informal Logic (induction)
Two Kinds of Thinking
Deduction & Induction: a co-dependent relationship
Circle of Logic
Valuing Deductions and Inductions & Cogency & etc.
From Reality to Truth

Abduction: http://individual.utoronto.ca/jmwilson/Biggs-Wilson-The-APriority-of-Abduction.pdf
Comparison of Induction & Deduction:
http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/DeductInduct.htm

Math Lessons on Induction & Deduction: https://www.khanacademy.org/math/algebra-home/alg-series-and-induction/alg-deductive-and-inductive-reasoning/v/deductive-reasoning-1

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