PHILOSOPHY 102
INTRODUCTION TO LOGIC

Instructor: Jeanine Weekes
Office: 1424 University Hall
Office Hours: Tuesday 3:15 pm – 5:15 pm and by appointment.
Contact Me: By email - weekes@uic.edu also by phone – 312.355.3255
You will find all relevant course materials here.
Text: Understanding Symbolic Logic, 4th edition by Virginia Klenk

Truth Tables. Memorize Them!
(Note that the website will be using > to represent the horeshoe and ≈ to represent the triple bar.
You can also download this as a pdf file.)

Operators
Tables
• Most often takes the form “…and…” in English sentences. The compound sentence it forms is called a conjunction. Its components are called conjuncts.
p
q
p • q
T
T
T
T
F
F
F
T
F
F
F
F
v Most often takes the form “…or…” in English sentences. The compound sentence it forms is called a disjunction. Its components are called disjuncts.
p
q
p v q
T
T
T
T
F
T
F
T
T
F
F
F
>Most often takes the form “if…then…” in English sentences. The compound sentence it forms is called a conditional. The sentence in the first blank is called the antecedent. The sentence in the second blank is called the consequent.
p
q
p > q
T
T
T
T
F
F
F
T
T
F
F
T
≈Most often takes the form “…if and only if…” in English sentences. The compound sentence it forms is called a biconditional.
p
q
p ≈ q
T
T
T
T
F
F
F
T
F
F
F
T
~ Most often takes the form “not…” in English sentences. The compound sentence it forms is called a negation.
p
~p
T
F
F
T