My Erdös Number

"A Mathematician is a machine for turning coffee into theorems."

Pál Erdös.

My Erdös Number is 6 (or possibly less):

1. Erdös, Pál; Shapiro, H.S.; Shields, A.L. Large and small subspaces of Hilbert space Mich. Math. J. 12, 169--178 (1965).
   Zentralblatt Review
2. Blondel, Vincent D.; Rupp, Rudolf; Shapiro, Harold S. On zero and one points of analytic functions. Complex Variables, Theory Appl. 28, No. 2, 189--192 (1995).
   Zentralblatt Review
3. Tsitsiklis, John N.; Blondel, Vincent D. The Lyapunov exponent and joint spectral radius of pairs of matrices are hard --- when not impossible --- to compute and to approximate. Math. Control Signals Syst. 10, No.1, 31-40 (1997).
   Zentralblatt Review
4. Dahleh, Munther A.; Sontag, Eduardo D.; Tse, David N.C.; Tsitsiklis, John N. Worst-case identification of nonlinear fading memory systems. Automatica 31, No.3, 503-508 (1995)
   Zentralblatt Review
5. Sontag, Eduardo D.; Wirth, Fabian R. Remarks on universal nonsingular controls for discrete-time systems. Systems and Control Letters 33, No.2, 81-88 (1998).
   Zentralblatt Review
6. Siebel, Nils T; Lang, Oliver; Wirth, Fabian; Gräser, Axel Robuste Positionierung eines Roboters mittels Visual Servoing unter Verwendung einer Trust-Region-Methode. Forschungsbericht Nr. 99-1 der Deutschen Forschungsvereinigung für Meß-, Regelungs- und Systemtechnik (DFMRS) e.V. (1999).
   Available for download as compressed PostScript (864 KB, German).

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