This shows how varied the solutions of such innocent looking
differential equation can be From the second half of the twentieth century attention
has been drawn to the investigation of this complicated nature of the solutions of
differential equations, under the heading ‘qualitative analysis of differential
equations’ Now-a-days, this has acquired prime importance being absolutely
necessary in almost all investigations —�
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© NCERT
not to be republished
 MATHEMATICS
424
�In most sciences one generation tears down what another has built and what
one has established another undoes