# 3.5.6 have no regrets

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… had induced me sometimes to say that if it were left to my choice I should have no objection to go over the same life from its beginning to the end.

–Benjamin Franklin

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2008.04.06 Sunday $copyright CHK^2$

# Nobel Prize x 2, part 1

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The Nobel Prize in Physics in 1956

Bardeen brought only one of his three children to the Nobel Prize ceremony. His two sons were studying at Harvard University, and Bardeen didn’t wanted to disrupt their studies. King Gustav scolded Bardeen because of this, and Bardeen assured the King that the next time he would bring all his children to the ceremony.

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The Nobel Prize in Physics in 1972

In 1972, John Bardeen shared the Nobel Prize in Physics with Leon Neil Cooper of Brown University and John Robert Schrieffer of the University of Pennsylvania for their jointly developed theory of superconductivity, usually called the BCS-theory.

Bardeen did bring all his children to the Nobel Prize ceremony in Stockholm, Sweden.

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— Wikipedia

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2008.04.06 Sunday $CHK_2$

# Octupole Expansion

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I have used a whole month to do this derivation.

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$V(\mathbf{R}) = ... + \frac{1}{4 \pi \varepsilon_0} \frac{3}{2 |\mathbf R|^4} \sum_{ijk} \hat R_i \hat R_j \hat R_k Q_{ijk} + ...$

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$Q_{ijk} = \int_{\mathbf r} \left[ \delta_{ij} ( r^2 - 5 r_i r_j + \frac{10}{3} r_i r_j \delta_{jk} ) r_k - |\epsilon_{ijk}| 10 r_i r_j r_k \right] \rho(\mathbf r) d^3 r$

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But I still do not know whether it is correct or not.

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2008.04.06 Sunday $\copyright CHK^2$