The increasingly booming online social networks promote the development of online health forum. People tend to solve kinds of health issues through the Internet. However, it is still unclear what the main characteristics of friendship networks are and how the users’ attribution affect the friendship ties establishment in the online health forum. This study uses the Exponential Random Graph Mode...

The topic of human relationships—be they positive and sympathetic, or negative and hostile—receives a great amount of attention in the Qur’ān. Human beings need to be aware of both their friends and their enemies in order to learn how to engage with both groups, how to make additional friends and defend themselves from harm caused by enemies, and, if possible, turn these enemies into friends. T...

For any simple graph H, let σ(H,n) be the minimum m so that for any realizable degree sequence π = (d1, d2, . . . , dn) with sum of degrees at least m, there exists an n-vertex graph G witnessing π that contains H as a weak subgraph. Let Fk denote the friendship graph on 2k+1 vertices, that is, the graph of k triangles intersecting in a single vertex. In this paper, for n sufficiently large, σ(...

Friendship is not institutionalized in American society; hence, perceptions of it vary. Rather than studying sources of this variation, most scholars ignore the complexity, bemoan the difficulty it causes in analysis, or eliminate it. We examined the frequency of use of previously studied and emergent characteristics of friendship as definitional criteria and the age, gender, and cultural patte...