Several Theorems of Algebroid Functions

The Nevanlinna theory is used, firstly, to investigate the uniqueness of algebroid functions, extend the strengthening five-valued theorem of meromorphic function to algebroid function and obtain the strengthening 3v+1-valued theorem of algebroid function and, secondly, to study the relation between the characteristic functions of two algebroid functions when they share less shared values and extend the four-valued theorem of meromorphic function.