['2.1', 'describes', 'in', 'detail', 'the', 'derivation', 'of', 'the', 'semi', '-', 'discrete', 'advection', '–', 'diffusion', 'problem', 'as', 'applied', 'to', 'wave', '-', 'like', 'solutions', ',', 'from', 'which', 'the', 'relevant', 'eigencurves', 'can', 'be', 'obtained', '.']