Source: https://www.tumblr.com/widgets/share/tool/preview?shareSource=legacy&canonicalUrl=&url=http%3A%2F%2Fwww.easterbrook.ca%2Fsteve%2F2010%2F01%2Finitial-value-vs-boundary-value-problems%2F&title=Initial+value+vs.+boundary+value+problems