About this resource
These IAL Pure Mathematics 4 (P4) notes on Proof by Contradiction provide a clear, step-by-step explanation of the method, tailored to Edexcel IAL exam requirements. The notes cover the logical structure of indirect proofs, common assumptions used in P4 questions, and fully worked examples that show how to reach a contradiction correctly. Ideal for revision and exam practice, they help students develop precise mathematical reasoning and avoid common mistakes in proof questions.