This function can be called with one or two arguments, with . 
Definitions:
| Fungrim symbol | Notation | Short description | 
|---|---|---|
| AGM | Arithmetic-geometric mean | 
Source code for this entry:
Entry(ID("b0d256"),
    SymbolDefinition(AGM, AGM(a, b), "Arithmetic-geometric mean"),
    Description("This function can be called with one or two arguments, with", Equal(AGM(z), AGM(1, z)), "."))