The initial value problem
\[
\frac{dy}{dt} = f(t, y), t > 0, y(0) = 1,
\]
where \( f(t, y) = -10 y \), is solved by the following Euler method:
\[
y_{n+1} = y_n + h f(t_n, y_n), n \geq 0, \text{with step-size} \, h.
\]
Then \( y_n \to 0 \) as \( n \to \infty \), provided