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explicit : calculate the state of a system at a later time from the state of the system at the current time
input이 현재의 것. output이 미래의 것
implicit methods find a solution by solving an equation involving both the current state of the system and the later one. 현재 과거 둘다로부터 솔루션을 찾음.
explicit
Y(t+delta) =F(Y(t))
implicit
G(Y(t+delta),Y(t)) = 0
to find Y(t+delta)....