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 ...

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 ...