AMTH140 Lecture 8. Symbolic Logic
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1 AMTH140 Lecture 8 Slide 1 Symbolic Logic March 10, 2006 Reading: Lecture Notes 6.2, 6.3; Epp 1.1, 1.2 Logical Connectives Let p and q denote propositions, then: 1. p q is conjunction of p and q, meaning p and q. It is true when both p and q are true. Slide 2 2. p q is disjunction of p and q, meaning p or q. Note that or is always used in the inclusive sense, so p q is true when p is true or q is true or both are true. 3. p is negation of p, meaning not p. It is true when p is false. 1
2 Truth Tables Slide 3 p q p q p q p q p p T T T T T T T F T F F T F T F T F T F F T T F F F F F F Application Let Slide 4 p = John is healthy q = John is wealthy r = John is wise How do we express: 1. John is healthy, wealthy and wise. 2. John is not wealthy, but he is healthy and wise. 3. John is wealthy, but he is not both healthy and wise. 2
3 p = John is healthy, q = John is wealthy, r = John is wise 1. John is healthy, wealthy and wise. p (q r) Slide 5 2. John is not wealthy, but he is healthy and wise. ( q) (p r) 3. John is wealthy, but he is not both healthy and wise. q ( (p r)) Logical Equivalence Slide 6 Two compound propositions P and Q are logically equivalent, written P Q, if the two propositions have the same truth values for all possible truth values of the component propositions. Examples De Morgan s Laws (p q) ( p) ( q) (p q) ( p) ( q) 3
4 Applications What is the negation of Slide 7 Let then 1 < x 4 p = the proposition 1 < x q = the proposition x 4 p q = the proposition 1 < x 4 By De Morgan s laws (p q) ( p) ( q) Slide 8 so i.e. or ( 1 < x 4) ( ( 1 < x)) ( (x 4)) 1 x or x > 4 x 1 or x > 4 4
5 p = John is healthy, q = John is wealthy, r = John is wise Slide 9 In symbols, John is wealthy, but he is not both healthy and wise is q ( (p r)) By De Morgan s laws (p r) ( p) ( r) So q ( (p r)) q (( p) ( r)) i.e. John is wealthy, and he is not healthy or he is not wise. Examples Distributive Laws These are p (q r) (p q) (p r) p (q r) (p q) (p r) Slide 10 Thus John is wealthy or he is healthy and wise. is logically equivalent to John is wealthy or healthy and he is wealthy or wise. 5
6 p (q r) (p q) (p r) p q r q r p q p r p (q r) (p q) (p r) T T T T T T T T T T F T T F T T Slide 11 T F T T F T T T T F F F F F F F F T T T F F F F F T F T F F F F F F T T F F F F F F F F F F F F Conditional Statements If p and q are propositions then the conditional statement if p then q or p implies q is denoted by p q. It is false when p is true and q is false, otherwise it true. Slide 12 In a conditional statement p q, p is called the hypothesis and q is called the conclusion. A conditional statement which is true by virtue of its hypothesis being false is said to be true by default. The proposition If = 3 then I am the king of England is true but uninformative. 6
7 Truth Table The proposition p q is true if either p is false or both p and q are true. p q p q Slide 13 T T T T F F F T T F F T Logical Equivalence p q ( p) q p q p p q ( p) q T T F T T Slide 14 T F F F F F T T T T F F T T T 7
8 Negation of a Conditional (p q) p ( q) Slide 15 p q p q q (p q) p ( q) T T T F F F T F F T T T F T T F F F F F T T F F Example is logically equivalent to If John is wealthy then is not wise. John is not wealthy or he is not wise. Slide 16 The negation is John is wealthy and he is wise. 8
9 Contrapositives The contrapositive of a conditional statement p q is the statement ( q) ( p). These are logically equivalent. Slide 17 p q ( q) ( p) p q q p p q ( q) ( p) T T F F T T T F T F F F F T F T T T F F T T T T Example The contrapositive of is If John is wealthy then is not wise. Slide 18 If John is wise then is not wealthy. 9
10 The Biconditional Slide 19 If p and q are propositions then the biconditional of p and q is p if and only if q and denoted by p q. It is true when p and q have the same truth value and false if they have opposite truth values. p q p q T T T T F F F T F F F T Logical Equivalence p q (p q) (q p) In words p if and only if q is logically equivalent to if p then q and if q then p or p implies q and q implies p. Slide 20 p q p q q p p q (p q) (q p) T T T T T T T F F T F F F T T F F F F F T T T T 10
11 Necessary and Sufficient Conditions If p and q are propositions then: 1. p is a necessary condition for q means that if q is true then it is necessary that p is true. Logically, q p. Slide p is a sufficient condition for q means that p being true is sufficient for q to be true. Logically, p q. 3. Thus p is a necessary and sufficient condition for q means q p and p q, i.e. p q, Example 1. John is wise is a necessary condition for John to be wealthy means that he can t be wealthy without being wise, i.e. if John is wealthy then he is wise. Slide John is wise is a sufficient condition for John to be wealthy means if John is wise then he is wealthy. 3. John is wise is a necessary and sufficient condition for John to be wealthy means John is wise if and only if he is wealthy or John is wise and wealthy or he is not wise and not wealthy. 11
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