COEF = 0.027
        self.COEF = COEF
        self.f_func = lambda x,t: -COEF*(-t*math.exp(x) - 12*(x**2)) + 2*t - math.exp(x) + x

        self.u_func = lambda x,t: -x**4+x+t*x+(t**2)-t*math.exp(x)
        self.interval = (0, 1)
        self.N = n
        self.M = m
        self.answer = np.zeros((self.N+1, 1), dtype=float)
        self.u_t0 = lambda x: -x**4+x
        self.u_x0 = lambda t: t**2-t
        self.u_x1 = lambda t: t+t**2-t*math.exp(1)