HL 5.1 - Deductive proof and counterexamples
SL 1.6: Simple deductive proof, numerical and algebraic; how to lay out a left-hand side (LHS) to right-hand side (RHS) proof; the symbols and notation for equality and identityHL 1.15: Use of a counterexample to show that a statement is not always true The most fundamental concept in mathematics is that of proof. The process of establishing the certainty of a mathematical statement in accordance with logical...