Tableau II

Primary colors, full intensity, neutrals Tableau II, 1921-1925... 

Modifications cristallines du trioxy-difluorure d osmium. — N. K. Jha ( ) a montre que OsOaFa se presente sous trois formes cristallines, mais aucune de ces formes n a ete proprement caract risee au point de vue structural. Les etudes de fluoration decrites ici nous ont permis de les mieux caracteriser, deux d entre elles (a et y OsOjFo) 6tant obtenues sous forme de monocristaux. Dans le tableau II, sont indiquees... 

Nous ne poss dons pas d interpretation sure de la bande satellite situee dans la region 2900-2950 cm 1 (et deplaeee par deuteration dans la region 2200-2250 cm 1 fig. 1 et tableau 1). II ne s agit pas d tine second frequence v0u (car, aussi bien dans NaHC03 que dans KHCG3>... 

En ce qui conceme l approximation basee sur le concept du volume libre, on precede de la meme maniere. Cependant, pour determiner la contribution de la temperature, on portera h aTxg — (/s—/y)//0/r en fonction de l/T, afin de determiner Eh et xg qui figurent dans l equation (57). En effet, les valeurs de fT sont deja connues A partir de l identifica-tion des isothermes avec l expression (60), grace au Tableau (A 3) de l Appendice 4, et l on a fg — fr + /(T — T). II faut noter toutefois que ce precede d identification suppose implicitement que b= 1. 

Fig. 22. Isothermes de dilatation du PAV II calculdes a partir des param tres du Tableau 7, correspondant aux. isothermes des figures 9 et 17...

In this case the concentration of Cu(II) is much smaller than Cf, that is, in the equation for Cj (second column of the tableau)... 

The mole balance equations illustrated for Pb(II) in connection with Tableau 6.5a can be generalized. For each metal ion, M" ,... 

Metal Ions in Aqueous Solution Aspects of Coordination Chemistry Tableau 6.5. Titration of Inoi anic Cu(II) System with Citrate... 

II y a des gens qui voleront un morceau dans un tableau de Rembrandt, le me-leront a une oeuvre composee dans un sens different sans le modifier, sans le digerer et sans trouver la colie pour le coller. 

II m est impossible de dire Tel tableau de Delacroix est le meilleur de ses tableaux car c est toujours le vin du meme tonneau, capiteux, exquis, sui generis 2... 

To treat the Tableau in this way and use it as a mirror of several significant facets of the world of pure chemical substances means to address and discuss in turn several different aspects and dimensions of this classificatory table. This implies that answers to questions that suggest themselves in the course of the investigation must often be postponed to later chapters that can build on a more complete picture. Therefore it may be particularly desirable at the outset to present a clear overview about how we will proceed in part II. 

In structuring part II, one of our concerns was to allow for different levels of interest in its topic. Readers who are primarily interested in the analysis of the classification of 1787, and less in its background and contexts, can concentrate on chapters 5, 7, and 10. Those less interested in the details of this analysis can concentrate on chapters 4 and 10 for the classification s connection with the Chemical Revolution, on chapter 6 for its conceptual foundation, on chapter 8 for the domains of practical, artisanal chemistry that form its background, and, finally, on chapter 9 for eighteenth-century classifications of pure chemical substances upon which the four authors of the Tableau could build. 

Among the graphical means by which the table represents the taxonomic units and their relations, there is one by which it transgresses the ordinary classificatory structure of hierarchically nested taxonomic units. The table arranges the taxonomic units in the manner of a matrix. Because of this layout, all of the genera and species are related in a twofold way to other units of the same rank. Vertically, they are related to those taxonomic units that are of the same class—either the class of simple substances (column I) or one of the five classes of compounds (colunms II-VI). Horizontally, the species are related to their compounds when they are simple substances.Or, if they are compound substances, they are related to one of their components and at the same time to other compounds of this component. Thus the Tableau contains two different, but coordinated classificatory systems vertically, a system that distributes genera of substances into either the class of simple substances or into one of the five classes of compounds and horizontally, one that orders compounds according to one simple substance that these compounds have in common. ... 

If we try to use formula (20.12) to compute the Euler characteristic of Horn (Cm, ii n)) we will need nontrivial reductions to get a nice answer. Using Proposition 20.21 instead yields a very simple formula directly. This reflects very well the reduction that often occurs in passing between tableaux in the spectral sequence computation, since using the filtration on the simphcial complex Hom i (T, G) as we did is the same as using the first tableau of our spectral sequence. 

II est cependant encore possible d tendre la systematique aux cas des mol6cules conjuguees. C est ainsi que la susceptibUite du groupe CO2 dans les acides reste egale —15,15 x 10 . Dans le cas des molecules aromatiques, il est facile de voir (tableau IV. 12) que la susceptibUite peut encore tre calculi a priori par Ja formule... 

The tableaux are important because (i) the shape of a tableau is in one-to-one correspondence with an irrep of Sa (ii) for a given shape, the standard tableaux are in one-to-one correspondence with basis functions carrying the irrep, their number thus giving the dimension of the irrep and (iii) from every set of standard tableaux it is possible to set up operators (equivalent to linear combinations of permutations) that, when acting upon an arbitrary function of numbered variables, will actually generate a set of basis functions that will carry the irrep. 

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