proof Flashcards
1
Q
what does ℕ, ℤ and ℝ mean?
A
ℕ - positive integers
ℤ - all integers
ℝ - all real numbers
2
Q
what does ∈ mean?
A
is a member of
3
Q
how do you start all proofs?
A
state the set it applies to, state the statement
4
Q
how do you end all proofs?
A
with a clear conclusion
5
Q
what is disproof by counter example?
A
find a case where it doesn’t apply
6
Q
what is proof by exhaustion?
A
going through every example until a conclusion is reached
