What was likely said next? Dialog:
Person 1) What is the meaning of Euler function?;
Person 2) Euler function In mathematics, the Euler function is given by Named after Leonhard Euler, it is a model example of a q-series, a modular form, and provides the prototypical example of a relation between combinatorics and complex analysis.;
Person 1) Can you give me an example?;
Person 2) The coefficient formula_2 in the formal power series expansion for formula_3 gives the number of all partitions of k.;
Person 1) what is the meaning of k?;
Person 2) That is, where formula_2 is the partition function of k.;
Person 1) Are there any other interesting aspects about this article?;
Person 2) 
The Euler identity, also known as the Pentagonal number theorem is  Note that formula_7 is a pentagonal number.