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Suppose two systems are connected as follows:

$\|H_{1}\|_{\infty }\|H_{2}\|_{\infty }\leq 1$

Lauricella equation of elasticity

$g_{j}(t)+{\frac {1}{2\pi i}}\int _{s}g_{j}(\zeta ){\frac {\partial }{\partial s}}ln({\frac {t-\zeta }{{\bar {t}}-{\bar {\zeta }}}})ds+{\frac {k_{j}}{2\pi i}}\int _{s}{\bar {g_{j}}}(\zeta ){\frac {\partial }{\partial s}}{\frac {t-\zeta }{{\bar {t}}-{\bar {\zeta }}}}ds=F_{j}(t)$

see also S. G. Mikhlin (1957), Integral Equations, Pergamon Press, London.

Chinese tests

李雨

Lee Teng-hui (traditional Chinese: 李登輝; simplified Chinese: 李登辉; pinyin: Lǐ Dēnghuī; Pe̍h-ōe-jī: Lí Teng-hui; born 15 January 1923) is a politician of the Republic of China (commonly known as Taiwan).

Kucera bio

http://arri.uta.edu/acs/VisitingLectures/Kucera05.doc

References

• D. C. Youla, H. A. Jabri, J. J. Bongiorno: Modern Wiener-Hopf design of optimal controllers: part II, IEEE Trans. Automat. Contr., AC-21 (1976) pp319-338
• V. Kucera: Stability of discrete linear feedback systems. In: Proceedings of the 6th IFAC. World Congress, Boston, MA, USA, (1975).
• C. A. Desoer, R.-W. Liu, J. Murray, R. Saeks. Feedback system design: the fractional representation approach to analysis and synthesis. IEEE Trans. Automat. Contr., AC-25 (3), (1980) pp399-412