Computer algebra systems began to appear in the 1960s and evolved out of two quite different sources the requirements of theoretical physicists and research into artificial intelligence a prime example for the first development was the pioneering work conducted by the later nobel prize laureate in physics martinus veltman who designed a program for symbolic mathematics especially high . Intriguingly for both pben d4 and bnlyp d4 the overall minimum is not as one might expect near the 25 advocated for thermochemistry in pbe0 on the basis of a perturbation theoretical argument but near 375 or 3 8 consistent with the pbe38 functional proposed by grimme and co workers and akin to the earlier mpw1k modified perdew wang with one parameter for kinetics functional with 42 . The metallabenzenoid denoted as c in figure 1 was reported by wang et al in 2013 with m os and e n and o there is a lack of theoretical calculations about their aromatic character nevertheless the authors classified this set of molecules to higher electron metal aromatic compounds without any further information
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