removable discontinuties
holes
nonremovable discontinuities
vertical asymptotes, jump discontinuities
continuity conditions
i. f(c) is defined
ii. the limit of f(x) as x approaches c exists
iii. the limit of f(x) as x approaches c is equal to f(c)
intermediate value theorem
since f(x) is continuous on [a,b], there must be a value c such that f(c) = __, since f(a) ≤ f(c) ≤ f(b)