By R. Carbó-Dorca, P.G. Mezey

This quantity highlights a number of the advances in molecular similarity. Molecular similarity examine is a dynamic box the place the fast move of rules and methodologies from the theoretical, quantum chemical and mathematical chemistry disciplines to effective algorithms and machine courses utilized in industrially very important purposes is principally obvious. those purposes frequently function motivating components towards new advances within the basic and theoretical fields, and the combo of highbrow problem and useful application offers mutual benefits to theoreticians and experimentalists. the purpose of this quantity is to offer an outline of the present methodologies of molecular similarity reviews, and to show new demanding situations, unsolved difficulties, and components the place vital new advances will be anticipated.

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**Extra resources for Advances in Molecular Similarity, Volume 2**

**Example text**

Integrals are computed between two normalized Is GTO functions corresponding to atoms a and b with centers R^ and R^, respectively. The most relevant QSTM elements are computed as follows: Overlap-like S(Q): Each element is computed taking into account the structure of the metric matrix with a positive definite operator, as the general integral: The use of such an integral form may become justified once one is aware of the simplified structure, which is associated with the present discussion, where only one Is GTO function is ascribed to a given atom.

As a consequence a synmietric matrix representation of every object in S is obtained. In general, when a multiple QSM, consisting of a product of p density functions, is chosen, a (/7-l)-dimensional hypermatrix can be attached to every object in set S. The procedures outlined so far may be modified in the following way. Until now it has been supposed here that all elements of a given molecular set have been used to represent the same molecular elements, producing, in this manner, square dimensional numerical collections of the active molecular structures.

The lowest value corresponds this time to complete similarity between compared objects, whereas the higher the value of the index, the more dissimilar the objects are. It must be mentioned here that QSI provides SL fuzzy relationship to the connections between the elements of QOS. See Ref. 36 for more details. This relationship can be extended to triple-density QSM involving three or more quantum objects. In the present discussion, all possible descriptions of similarity indices, computed by means of QSM manipulations, will necessarily belong to one or another of these two classes.