A1: Proof
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From the DfE Mathematics AS and A-Level Content (LINK):
Proof by Contradiction
Proof by Contradiction
A1-10 Introducing Proof by Contradiction
A1-10 Introducing Proof by Contradiction
A1-11 Proving √2 is Irrational
A1-11 Proving √2 is Irrational
A1-12 Proving √3 is Irrational
A1-12 Proving √3 is Irrational
A1-13 Proving √3 is Irrational - Alternative
A1-13 Proving √3 is Irrational - Alternative
A1-14 Proving the Cube Root of 2 is Irrational
A1-14 Proving the Cube Root of 2 is Irrational
A1-15 Proving there are Infinitely Many Primes
A1-15 Proving there are Infinitely Many Primes
A1-16 Proof by Contradiction Examples
A1-16 Proof by Contradiction Examples