content_image/346934.jpg content_image/346935.jpg content_image/346936.jpg content_image/346937.jpg
<img src='content_image/346934.jpg'>

where P nn is the factor of the indirect communication between the persons who do not watch the movie at the time t . 

For the direct communication between the watched person and the unwatched person can be written as follows, 

<img src='content_image/346935.jpg'>

where D ny is the factor of the direct communication between the watched person and the unwatched person. For the indirect communication, we obtain more two terms corresponding to the indirect communication due to the communication between the watched persons and that between the watched person and the unwatched person as follows, 

<img src='content_image/346936.jpg'>

where P yy is the factor of the indirect communication between the watched persons and P ny is the factor of the indirect communication due to the communication between the watched person and the unwatched person at the time t . 

Finally, we obtain the equation of the mathematical model for hit phenomena within the mean field approximation as follows, 

<img src='content_image/346937.jpg'>

