Role-Playing Games: Motivations, Emotional Investment, Relationships and Problematic Usage by Nicholas Yee [ Yee, N. (2006). The Psychology of MMORPGs: Emotional Investment, Motivations, Relationship Formation, and Problematic Usage. In R. Schroeder & A. Axelsson (Eds.), Avatars at Work and Play: Collaboration and Interaction in Shared Virtual Environments (pp. 187-207). London: Springer-Verlag. ]

We first answer a question of de Caen [Extremal Problems for Finite Sets, János Bolyai Math. Soc., Budapest, 1994, pp. 187–197]: given r ≥ 3, if G is an r-uniform hypergraph on n vertices such that every r + 1 vertices span 1 or r + 1 edges, then G = Kr n or K r n−1, assuming that n > (p − 1)r, where p is the smallest prime factor of r − 1. We then show that the Turán density π(Kr r+1) ≤ 1 − 1/...

@1# Bryson, Jr., A. E., and Ho, Y-C., 1975, Applied Optimal Control, Optimization, Estimation, and Control, Hemisphere, New York. @2# Anderson, B. D. O., and Moore, J. B., 1990, Linear Optimal Control, PrenticeHall, NJ. @3# Chankong, V., and Peng, T. K. C., 1983, Multiobjective Decision Making— Theory and Methodology, Elsevier, New York. @4# Thompson, A. G., 1976, ‘‘Active suspension with optim...

1 For example, A. R. Lacey, "Quantifier Words", in A. R. Lacey.vi Dictionary of Philosophy (Charles Scribner's Sons, N. Y.: 1976); Alex Orenstein, Existence and the Particular Quantifier (Temple U. Press, Philadelphia: 1978), pp. 105-07; Baruch Brody, "Glossary of Logical Terms", Encyclopedia of Philosophy, Vol. 5 (Macmillan, N. Y.: 1967), p. 64; Antony Flew, "Existential Import", in Antony Fle...

4th International Workshop on Functional-Structural Plant Models, 7-11 june 2004 –Montpellier, France Edited by C. Godin et al., pp. 187-189 Fungal bioinsecticide survival in response to UVB in 3D digitized grapevine canopies: a simulation study Nathalie Smits, Hervé Sinoquet : UMR INRA-ENSAM-CIRAD-IRD Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, CS 300...

In this paper we prove that the P(q, ) (q odd prime power and > 1 odd) commutative semifields constructed by Bierbrauer (Des. Codes Cryptogr. 61:187–196, 2011) are isotopic to some commutative presemifields constructed by Budaghyan and Helleseth (SETA, pp. 403–414, 2008). Also, we show that they are strongly isotopic if and only if q ≡ 1(mod 4). Consequently, for each q ≡−1(mod 4) there exist i...