##
**Model of student migration**

exm1

Variables and parameters:
*y*_{1}(*t*): number of students studying option 1

*y*_{2}(*t*): number of students studying option 2

:
input of fresh students per time interval

*a*: effectiveness of communication between the students *y*_{1} and *y*_{2}

:
backflow from *y*_{2} to *y*_{1} (
)

*d*_{1}: rate of successful final examination of *y*_{1} (*d*_{1}=0.1)

*d*_{2}: rate of successful final examination of *y*_{2} (*d*_{2}=0.3)

:
portion of graduate students (
)

mapping:

bounds:

Figure 1

Phase-diagram of the
(*y*_{1}^{j}, *y*_{2}^{j})-values for
*j*=0,1,...,40,
,
*a*=0.002.

###
Postscript-Files for better printing results:

This document

Figure 1