02.28.2017. Tuesday
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 Thinking Operations
Binomial theorem
⦿ Binomial theorem
Combinatorics
⦿ Permutations
⦿ Combination
⦿ Variation
Sets
⦿ Operations on Sets
Logic
⦿ Logical Operations and Truth Tables


Logic

Logical Operations and Truth Tables

A mathematical sentence is a sentence that states a fact or contains a complete idea. A sentence that can be judged to be true or false is called a statement.
The statement can be  true (T) or false (⊥).
P, Q, R,... statements

Example:

This girl is beatiful. - not a statement.

Today is Wensday. - statement.

Negation (¬) (not)

P
¬P

Disjunction (∨) (or)

P
Q
P∨Q

Conjunction (∧) (and)

P
Q
P∧Q

Implication (⇒) (if ..., than...)

P
Q
P⇒Q

Equality (⇔) (biconditional)

P
Q
P⇔Q