Given that d3 d3 = d2 d2 and x = d d d2 d2 ,

Question:

Given that d3η

dτ3 = −η

d2η

dτ2 and x =

η dη

d2η

dτ2

, y=


2

η d2η

dτ2

, and t = log





, prove that

˙ x = x(1 + x + y), ˙ y = y(2 + x − y).

Plot a phase portrait in the xy plane.

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