Figure 1
From: Efficient solutions of systems of fractional PDEs by the differential transform method

For : exact and approximate solutions (red and blue colored surfaces, respectively) ( and (left- and right-hand sides, respectively)).
Theory and Modern Applications
From: Efficient solutions of systems of fractional PDEs by the differential transform method
For : exact and approximate solutions (red and blue colored surfaces, respectively) ( and (left- and right-hand sides, respectively)).