Figure 5From: An attractive numerical algorithm for solving nonlinear Caputo–Fabrizio fractional Abel differential equation in a Hilbert spaceFractional level curves of approximate solution of Example 5.3: blue \(\alpha = 0.8\), yellow \(\alpha = 0.85\), green \(\alpha = 0.9\), red \(\alpha = 0.95\), and black line \(\alpha =1\)Back to article page