Full text: The Trend 1968 Version

Particular solution:   F(t)= ce βt
broader type of solution
nearly exponential function
? F(t)  
F(t)       <?              maximum rate of change:
                               F(t) is a slowly changing function
Yt+?-ayt-b?yt= yt+I-yt+(I-a)yt-b?yt=F(t)

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