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By Giuzzi L.

A brief evidence is given for the most results of THEOREM 1: A unital in PG(2,q) is classical if and provided that it truly is preserved by means of a cyclic linear collineation team of order q-sqrt(q)+1

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If, for instance, experiments are compared that were performed in different solvents, then an increase or 25 Chapter 2 decrease in kt might dominantly be caused by a change in the radical chain length distribution, which might arise as a result of slightly different viscosities of the solvents. It should be stressed that this does not mean that coil dimensions and coil repulsion effects are not important. It simply means that an important phenomenon of termination, namely its chain-length dependence, has not been taken into account in discussing experimental observations.

In the laser initiated solution polymerization of MMA, Beuermann et al. [124] observed that the value of increased with decreasing monomer fraction. The authors concluded that chain-length dependent termination contributed to their experimental findings (although the variation of with monomer fraction was too strong to be explained by this phenomenon alone). Fernández-Garcia et al. [155] found lower values in the polymerization of MMA when using solvents in which the average degree of polymerization was increased.

Gebert et al. [190] have drawn similar conclusions from their quenching study of polystyrene containing randomly distributed anthracene labels along the polymer chains. An interesting dynamic picture of segmental diffusion emerges from the latter studies in which two anthryl endgroups were used. In two of these studies [193, 194], the diffusion-controlled intramolecular triplet-triplet annihilation of terminal anthryl groups was studied, which thus indicates how fast two end groups of the same polymer molecule encounter with each other.

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