Read: Van Cleave, section 2.11. Do exercise sets 16 & 17.
8 Rules of valid inference:
Modus
Ponens (MP)
p⊃q,
p
∴
q
Modus Tollens (MT)
p⊃q,
~q
∴
~p
Disjunctive Syllogism (DS)
p∨q,
~p
∴
q
p∨q,
~q
∴
p
Simplication (Simp)
p.q
∴
p
p.q
∴
q
Conjunction (Conj)
p,
q
∴
p.q
Hypothetical Syllogism (HS)
p⊃q,
q⊃r
∴
p⊃r
Addition(Add)
∴
p∨q
Constructive Dilemma (CD)
(p⊃q),
(r⊃s),
p∨r
∴
q∨s
Quiz #1; 10 am section
1. Is the following a statement?
“Please help yourself to more tofu.”
2. Define statement, premise, and conclusion.
3. List 2 premise indicators and 2 conclusion indicators.
4. What is the difference between an explanation and an
argument?
5. Is the following argument valid? Why or why not?
“All dogs are reptiles; Fido is a reptile; Therefore, Fido
is a dog.”
6. Reproduce the chart that depicts the nature induction and
deduction.
7. Why is the “is-ought” gap an issue in logic?
8. Give an example of an enthymeme and then supply the
missing premise.
9. Produce a truth table for conjunction.
10. True or false: logic is the study of empirical observation.
Read and do exercises, Van Cleave, 2.1-2.5 & 2.7
Begin reading and working through the exercises in Van Cleave, 1.3; and 1.6-1.9
Supplemental (on the is-ought gap):
Things to do:
2. Read Van Cleave, 1.1-1.2. In your notebook dedicated to this class, do all of the exercises. Bring questions/comments to class.
Welcome to Logic and Critical Thinking.
Things to do:
