modified:   Makefile
	new file:   animate_wave.py
	modified:   background.pdf
	modified:   background.tex
	new file:   energy_of_standing_wave.png
	modified:   rkf45.cpp
	modified:   rkf45.hpp
	new file:   standing_wave.cpp
	modified:   wave_equation.cpp
	modified:   wave_equation.hpp
	modified:   wave_equation_test_driver.cpp
	deleted:    auto/background.el