Reemergence of VB Theory

Of course there was a reason for the retention of resonance-theoretic explanations in text-books such explanations offered conceptual simplicity and connection with the classical chemical-bonding ideas. Moreover starting in the 1970s and more especially so in the 1980s there turned out to be dramatic 

Further in 1986 P. W. Anderson suggested [76] that resonating VB theory would be crucial to the understanding of high-temperature superconductivity. This 

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