What can disprove a conjecture?
A counter-example can disprove a conjecture.
What are two methods of proving a conjecture?
Proof by deduction and proof by exhaustion.
What does A ⟹ B signify?
A is a sufficient condition for B.
What does A ⟸ B signify?
A is a necessary condition for B.
What is the converse of A ⟹ B?
The converse is A ⟸ B.
What does ⟸ mean ?
⟸ means ‘is implied by’ or ‘follows from’.
What does ⟹ mean?
⟹ means ‘implies’ or ‘if…then’ or ‘therefore’.
What does ⟺ mean?
⟺ means ‘implies and is implied by’ or ‘is equivalent to’