MathMathematical Proofs; A Transition to Abstract MathematicsMathematical Proofs; A Transition to Abstract MathematicsSets Logic Direct Proof and Proof by Contrapositive More on Direct Proof and Proof by Contrapositive Existence and Proof by Contradiction Mathematical Induction Prove or Disprove Equivalence Relations Functions Cardinalities of Sets Proofs in Number Theory Proofs in Calculus Proofs in Group Theory