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Implicit, single-stage, first-order, fixed-step, Runge-Kutta method.[^1] ```math \frac{dy}{dt} = f(t, y) ``` ```math t_{n+1} = t_n + h ``` ```math k_1 = f(t_{n+1}, y_{n+1}) ``` ```math y_{n+1} = y_n + hk_1 ``` [^1]: Also known as the backward Euler method.