Abstract: In this note, we define strong and weak common quadratic Lyapunov functions (CQLFs) for sets of linear time-invariant (LTI) systems. We show that the simultaneous existence of a weak CQLF of ...

Oppo Find X9 series is confirmed to launch in China in the third week of October. The company, via Weibo, has confirmed the launch date of the latest Find X series smartphones in the country on Monday ...

Three Russian fighter jets have violated Estonia’s airspace in an ‘unprecedentedly brazen’ incursion onto NATO territory. Estonia’s foreign minister said the MiG-31 military planes, capable of ...

After launching the F31 series in India, Oppo is now preparing to launch its next flagship lineup, the Find X9 series, in China. The new lineup will succeed last year’s Find X8 series and will likely ...

Much of the development effort for the upcoming Oppo Find X9 series has been focused on making the cameras even better. The company continues its collaboration with Hasselblad and its work on the ...