In many applied mathematical problems, we encounter systems of
simultaneous linear differential equations involving two (or more)
dependent variables x and y and one independent variable t, as follows:
12
12
()()()
()()()
fDxfDyft
gDxgDygt
+=
⎫
⎬
+=
⎭
(3.160)
Where
1212
,,,ffgg
are rational integral functions ...
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