Vol.17, No.4

  Almost quasi-continuous functions

Author : TAKASHI NOIRI

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  A commutativity result for rings

Author : H. A. S. ABUJABAL and M. S. KHAN

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  Stability under persistent disturbances for systems with impulses via Lyapunov's direct method

Author : G. K. KULEV and D. D. BAINOV

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  On the iterative combination of Phillips operators

Author : P. N. AGRAWAL and VIJAY GUPTA

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