new file:   3dDensitySample.nb
modified:   condensedMatterProblemSet1Problem1.tex
modified:   condensedMatterProblemSet1Problem3.tex
new file:   qmSolidsPs1P3b.nb
new file:   qmSolidsPs2P3aFig5.png
modified:   renumber
new file:   ../phy487/source/Makefile
new file:   ../phy487/source/madelung.cpp