Let \( f(\mathrm{x})=\mathrm{x} \cdot\left[\frac{\mathrm{x}}{2}\rig...

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Let \( f(\mathrm{x})=\mathrm{x} \cdot\left[\frac{\mathrm{x}}{2}\right] \), for \( -10\mathrm{x}10 \), where \( [\mathrm{t}] \) denotes the greatest integer function. Then the number of points
\( \mathrm{P} \) of discontinuity of \( f \) is equal to

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