ecuació diferencial series

y(x) = ∑ ( k^{m}·x^{(k+1)} )


x·d_{x}[y(x)] = ∑ ( k^{(m+1)}·x^{(k+1)} )+y(x)


x·d_{x}[ ∑ ( k^{m}·x^{(k+1)} ) ] = ∑ ( (k+1)·k^{m}·x^{(k+1)} )