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What does one valid counterexample do to a universal statement?
A
An untested value could be a counterexample.
B
To prove a universal statement, cover every permitted case; to disprove it, give one valid counterexample.
C
The domain is finite and every allowed value is checked.
D
It disproves the entire statement.
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1.1.2 Proof Flashcards
20 flashcards on WJEC A Level Maths 1.1.2 Proof: the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.