Logic

Front

What does the symbol ↔ mean?

Back

if and only if

Front

What is a counterexample?

Back

A specific case that shows a statement is false.

Front

What is the Law of Detachment?

Back

If 'If P, then Q' is true and P is true, then Q must also be true.

Front

What does it mean for two angles to be supplementary?

Back

The sum of the measures of two angles is 180 degrees.

Front

What is the inverse of a conditional statement?

Back

If not P, then not Q.

Front

What is a valid conclusion?

Back

A conclusion that logically follows from the premises.

Front

What is a conditional statement?

Back

A statement in the form 'If P, then Q'.

Front

What is a biconditional statement?

Back

A statement that combines two conditional statements, true in both directions.

Front

What is a hypothesis in a conditional statement?

Back

The part of the statement that follows 'if'.

Front

What is a conclusion in a conditional statement?

Back

The part of the statement that follows 'then'.