1. Which expression is a mathematical assertion?
2. When is the inclusive disjunction A or B true?
3. In the implication A ⇒ B, what is the logical relationship between A and B?
What is a mathematical assertion?
A statement that is unambiguously either true or false.
When is the conjunction A and B true?
Only when both A and B are true.
When is the inclusive disjunction A or B true?
When at least one of A and B is true.
What does the implication A ⇒ B require?
B to be true whenever A is true.
What is the contrapositive of A ⇒ B?
¬B ⇒ ¬A.
What does the existential quantifier ∃x mean?
At least one x satisfies the assertion.
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