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Why the Riccati equation $\frac{\mathrm{d} y}{\mathrm{d} x} =ax^{m}+by^{2}$ has an elementar...

The special form of Riccati equation $$ \frac{\mathrm{d} y}{\mathrm{d} x} =ax^{m}+by^{2} $$ has been proved that it is solvable if and only if $m=0$, $m=-2$, $m=4k/(2k\pm 1)$. The sufficiency is obvio …
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