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conjecture
unproven statement that is based on observations

inductive reasoning
when you find a pattern in specific cases and then write a conjecture for the general case

counterexample
a specific case for which the conjecture is false

conditional statement
logical statement with hypothesis and conclusion



if then form
the "if" part contains the hypothesis and the "then" part contains the conclusion

converse
switch hypothesis and conclusion

inverse
original negative

contrapositive
converse negative

equivalent statements
when 2 statements are both true or both false

perpendicular lines
when two lines intersect to form right angle.

biconditional statement
contains phrase if and only if



