Question: Consider the backward difference method for solving the heat equation ut = Uxx un+1 2u7+1 h k LTE un = n+1 Ui+l where k

Consider the backward difference method for solving the heat equation ut = Uxx un+1 2u7+1 h k LTE un = n+1

Consider the backward difference method for solving the heat equation ut = Uxx un+1 2u7+1 h k LTE un = n+1 Ui+l where k is the time step and h is the grid spacing. The local truncation error, denoted by LTE, of this method is given by the equation n+1 + U-1 u(i,n+1) u(i,n) (i+1, n+1) 2u(2i,n+1)+u(2i-1,n+1) k 1 h (1) where u(x, t) denotes the exact solution to the heat equation. Using equation (1), write down an expression for the local truncation error. What is the order of accuracy of this method?

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