In the old IUPAC system the letters A and B were designated to the left ( A ) and right ( B ) part of the table, while in the CAS system the letters A and B are designated to main group elements ( A ) and transition elements ( B ).
32.
There is in fact no need to pass to a " third " barycentric subdivision : as Haefliger observes using the language of category theory, in this case the 3-skeleton of the fundamental domain of " X " " already carries all the necessary data including transition elements for triangles to define an edge-path group isomorphic to ?.
33.
Elected to the Royal Society of Chemistry in 1970, and to the Royal Society in 1976, he was awarded the Davy Medal " In recognition of his many distinguished contributions to organometallic chemistry, including the discovery that species containing carbon-metal of metal-metal multiple bonds are versatile reagents for synthesis of cluster compounds with bonds between different transition elements " in 1989.
