CSL105: Discrete Mathematical Structures. Ragesh Jaiswal, CSE, IIT Delhi


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2 Propositional Logic: logical operators Negation ( ) Conjunction ( ) Disjunction ( ). Exclusive or ( ) Conditional statement ( ) Biconditional statement ( ): Let p and q be propositions. The biconditional statement p q is the proposition p if and only if q. The biconditional statement p q is true when p and q have the same truth values, and is false otherwise. Biconditional statements are also called biimplications. p q p q T T T T F F F T F F F T Table: Truth table for p q.
3 Propositional Logic: logical operators Negation ( ) Conjunction ( ) Disjunction ( ). Exclusive or ( ) Conditional statement ( ) Biconditional statement ( ): Let p and q be propositions. The biconditional statement p q is the proposition p if and only if q. The biconditional statement p q is true when p and q have the same truth values, and is false otherwise. Biconditional statements are also called biimplications. p q is also expressed as: p is necessary and sufficient for q p iff q if p, then q and conversely Show that p q always has the same truth value as (p q) (q p).
4 Propositional Logic Logical operators Negation ( ) Conjunction ( ) Disjunction ( ). Exclusive or ( ) Conditional statement ( ) Biconditional statement ( ) A compound proposition is formed by applying these operators on simpler propositions. E.g. (p q r). Operator Precedence (in decreasing order):,,,,,. Construct the truth table for p q p q.
5 Propositional logic: Applications Simplify complex sentences and enable to logically analyze them. You cannot ride the roller coaster if you are under 4 feet tall unless you are older than 16 years old. p: You can ride the roller coaster. q: You are under 4 feet tall. r: You are older than 16 years old. Express the sentence in terms of propositions p, q, and r.
6 Propositional logic: Applications Simplify complex sentences and enable to logically analyze them. You cannot ride the roller coaster if you are under 4 feet tall unless you are older than 16 years old. p: You can ride the roller coaster. q: You are under 4 feet tall. r: You are older than 16 years old. Express the sentence in terms of propositions p, q, and r. (q r) p.
7 Propositional logic: Applications Simplify complex sentences and enable to logically analyze them. Translate system specification expressed in natural language into unambiguous logical expressions. Example: The diagnostic message is stored in the buffer or is retransmitted. The diagnostic message is not stored in the buffer. If the diagnostic message is stored in the buffer, then it is retransmitted. The diagnostic message is not transmitted. Consistency: Whether all the specifications can be satisfied simultaneously. Are these specifications consistent?
8 Propositional logic: Applications Simplify complex sentences and enable to logically analyze them. Translate system specification expressed in natural language into unambiguous logical expressions. Resolve complex puzzling scenarios. Example: An island has two kinds of inhabitants, knights and knaves. Knights always tell the truth and Knaves always lie. You meet two people on this island A and B. What are A and B if A says B is a knight and B says The two of us are opposite types?
9 Propositional logic Definition (Tautology and Contradiction) A compound proposition that is always true, no matter what the truth values of the proposition that occurs in it, is called a tautology. A compound proposition that is always false is called a contradiction. A compound proposition that is neither a tautology nor a contradiction is called a contingency. Examples: (p p) is a tautology. (p p) is a contradiction. Definition (Logical equivalence) A compound proposition p and q are called logically equivalent if p q is a tautology. The notation p q denotes that p and q are logically equivalent.
10 Propositional logic Definition (Tautology and Contradiction) A compound proposition that is always true, no matter what the truth values of the proposition that occurs in it, is called a tautology. A compound proposition that is always false is called a contradiction. A compound proposition that is neither a tautology nor a contradiction is called a contingency. Definition (Logical equivalence) Compound propositions p and q are called logically equivalent if p q is a tautology. The notation p q denotes that p and q are logically equivalent. Show that p and q are logically equivalent if and only if the columns giving their truth values match. Show that (p q) p q.
11 End
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