摘 要: | The essential maximality of a Riemann surface of O_(AD)~0 is verified.Actually we haveproved something a little stronger,i.e.a modified Stoilow principle and its conversefor a functiou meromorphic on a non-compact subregion on a Riemann surface of O_(AD)~0.The significance of these assertions lies in that they fail to hold for the wider and morefamiliar class O_(AD).
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