See Ahlfors theory on Wiktionary
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"ref": "1968, Joseph Belsley Miles, The Asymptotic Behavior of the Counting Function for the A-values of a Meromorphic Function, University of Wisconsin-Madison, page 29:",
"text": "In this chapter we use Ahlfors' theory of covering surfaces to obtain results on the functional n(r,a).",
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"ref": "1986, Pacific Journal of Mathematics, volumes 122-123, page 441:",
"text": "Terms of the form o(A(r)) in Ahlfors theory are given in the form cD(r) where c is a constant.",
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"ref": "2004, G. Barsegian, “A new program of investigations in analysis: Gamma-lines approaches”, in G. Barsegian, I. Laine, C. C. Yang, editors, Value Distribution Theory and Related Topics, Kluwer Academic, page 43:",
"text": "The Ahlfors theory itself describes covering of curves or domains, but not covering of distinct, complex values #x5C;boldsymbol#x7B;a#x7D;.",
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"A geometric counterpart to Nevanlinna theory that extends the applicability of the concept of covering surface (of a topological space) by defining a covering number (a generalised \"degree of covering\") applicable to any bordered Riemann surface equipped with a conformal Riemannian metric."
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"(complex analysis, differential geometry) A geometric counterpart to Nevanlinna theory that extends the applicability of the concept of covering surface (of a topological space) by defining a covering number (a generalised \"degree of covering\") applicable to any bordered Riemann surface equipped with a conformal Riemannian metric."
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