Logic
It's a fact that can be agreed to be either true or false.
What is a statement?
It's the term for an argument that has an untrue premise.
What is unsound?
They're the 'if' and 'then' parts of a conditional statement.
What are the antecedent and consequent?
It's Euclid's postulate on circles.
It's how Euclid defines equality, the fourth common notion.
What is, 'things which coincide with one another are equal to one another'?
It's what happens when you add or remove a 'not' from a statement.
What is a negation?
It's the term for an argument that links statements using incorrect logic.
What is invalid?
It's another way of expressing a conditional statement, symbolized by an arrow.
What is 'implies' or 'implication'?
It's Euclid's postulate on points.
What is, 'a straight line can be drawn between any two points'?
It's Euclid's second common notion, about addition.
What is, 'if equals be added to equals, the wholes are equal'?
It's a series of logically connected statements designed to preserve truth.
What is an argument?
It's when an argument fails by changing the meaning of words partway through.
What are equivocal terms?
It's when you swap the antecedent and consequent of a conditional statement.
What is the converse?
It's Euclid's postulate on lines.
What is, 'a straight line can be extended indefinitely in either direction'?
It's Euclid's third common notion, about subtraction.
What is, 'if equals be subtracted from equals, the remainders are equal.'.
It's the beginning point of an argument that's taken to be true.
What is a premise?
It's a lapse of logic connecting statemenbts in a logical argument.
What is a fallacy?
It's when you swap and negate the antecedent and consequent of a conditional statement. It preserves truth.
What is the contrapositive?
It's Euclid's postulate on angles.
What is, 'all right angles are equal'?
It's Euclid's fundamental notion about how equal things are related. (The first common notion.)
What is, 'things which are equal to the same thing are equal to each other'?
It's something that is assumed to be true for any argument on a given topic.
What is an axiom or postulate?
It's the fallacy of attacking your opponent rather than your opponent's argument.
What is the ad hominem fallacy?
It's when you negate the antecedent and consequent of a conditional statement.
What is the inverse?
It's Euclid's fifth postulate, the weird one!
What is, 'if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines if produced indefinitely, meet on that side on which the angles are less than two right angles'.
It's the only common notion that doesn't deal with equality.
What is, 'the whole is greater than the part'?